US11279117B2 - Fuel container - Google Patents
Fuel container Download PDFInfo
- Publication number
- US11279117B2 US11279117B2 US16/307,006 US201716307006A US11279117B2 US 11279117 B2 US11279117 B2 US 11279117B2 US 201716307006 A US201716307006 A US 201716307006A US 11279117 B2 US11279117 B2 US 11279117B2
- Authority
- US
- United States
- Prior art keywords
- layer
- ethylene
- μmol
- fuel container
- evoh
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active, expires
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- 239000000446 fuel Substances 0.000 title claims abstract description 104
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 claims abstract description 166
- 239000004840 adhesive resin Substances 0.000 claims abstract description 85
- 229920006223 adhesive resin Polymers 0.000 claims abstract description 85
- 239000011342 resin composition Substances 0.000 claims abstract description 77
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 69
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 67
- 239000011777 magnesium Substances 0.000 claims abstract description 49
- 239000011701 zinc Substances 0.000 claims abstract description 41
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 39
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 35
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 32
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims abstract description 30
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 30
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000005977 Ethylene Substances 0.000 claims abstract description 21
- 229920000098 polyolefin Polymers 0.000 claims abstract description 20
- 239000002253 acid Substances 0.000 claims abstract description 16
- 229910052783 alkali metal Inorganic materials 0.000 claims description 20
- 229920005989 resin Polymers 0.000 claims description 16
- 239000011347 resin Substances 0.000 claims description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 claims description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 6
- 150000001340 alkali metals Chemical class 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 26
- 230000004888 barrier function Effects 0.000 abstract description 14
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 description 142
- 239000004715 ethylene vinyl alcohol Substances 0.000 description 140
- 239000010410 layer Substances 0.000 description 92
- 230000007423 decrease Effects 0.000 description 21
- 229910052751 metal Inorganic materials 0.000 description 20
- 239000002184 metal Substances 0.000 description 18
- -1 polyethylene Polymers 0.000 description 18
- 150000003839 salts Chemical class 0.000 description 18
- 239000000654 additive Substances 0.000 description 17
- 239000000463 material Substances 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 14
- 238000000071 blow moulding Methods 0.000 description 13
- 239000002356 single layer Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 11
- 239000008188 pellet Substances 0.000 description 11
- 239000011734 sodium Substances 0.000 description 11
- 239000002994 raw material Substances 0.000 description 10
- 238000007127 saponification reaction Methods 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 239000010936 titanium Substances 0.000 description 9
- 239000011575 calcium Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 8
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 6
- 238000000465 moulding Methods 0.000 description 6
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 6
- SCVFZCLFOSHCOH-UHFFFAOYSA-M potassium acetate Chemical compound [K+].CC([O-])=O SCVFZCLFOSHCOH-UHFFFAOYSA-M 0.000 description 6
- 229920001567 vinyl ester resin Polymers 0.000 description 6
- 239000006096 absorbing agent Substances 0.000 description 5
- 239000003963 antioxidant agent Substances 0.000 description 5
- 239000002216 antistatic agent Substances 0.000 description 5
- 229910052791 calcium Inorganic materials 0.000 description 5
- 239000003086 colorant Substances 0.000 description 5
- 239000000945 filler Substances 0.000 description 5
- 239000000314 lubricant Substances 0.000 description 5
- 150000002739 metals Chemical class 0.000 description 5
- 239000004014 plasticizer Substances 0.000 description 5
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 4
- 229910019142 PO4 Inorganic materials 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 4
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 4
- UKMSUNONTOPOIO-UHFFFAOYSA-N docosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCC(O)=O UKMSUNONTOPOIO-UHFFFAOYSA-N 0.000 description 4
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 239000012760 heat stabilizer Substances 0.000 description 4
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 4
- UTOPWMOLSKOLTQ-UHFFFAOYSA-N octacosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCCCCCCCC(O)=O UTOPWMOLSKOLTQ-UHFFFAOYSA-N 0.000 description 4
- 235000021317 phosphate Nutrition 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000005481 NMR spectroscopy Methods 0.000 description 3
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 3
- 229910052771 Terbium Inorganic materials 0.000 description 3
- 150000001639 boron compounds Chemical class 0.000 description 3
- 150000001735 carboxylic acids Chemical class 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 description 3
- MCPKSFINULVDNX-UHFFFAOYSA-N drometrizole Chemical compound CC1=CC=C(O)C(N2N=C3C=CC=CC3=N2)=C1 MCPKSFINULVDNX-UHFFFAOYSA-N 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 239000002828 fuel tank Substances 0.000 description 3
- 229960001545 hydrotalcite Drugs 0.000 description 3
- 229910001701 hydrotalcite Inorganic materials 0.000 description 3
- 229920001684 low density polyethylene Polymers 0.000 description 3
- 239000004702 low-density polyethylene Substances 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 235000011056 potassium acetate Nutrition 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 239000001632 sodium acetate Substances 0.000 description 3
- 235000017281 sodium acetate Nutrition 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229910052715 tantalum Inorganic materials 0.000 description 3
- 238000003856 thermoforming Methods 0.000 description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 2
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 2
- XHALKWMTKWHQLO-UHFFFAOYSA-N 2-tert-butyl-4-(3-tert-butyl-4-hydroxyphenyl)sulfanylphenol Chemical compound C1=C(O)C(C(C)(C)C)=CC(SC=2C=C(C(O)=CC=2)C(C)(C)C)=C1 XHALKWMTKWHQLO-UHFFFAOYSA-N 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 2
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 2
- 235000021357 Behenic acid Nutrition 0.000 description 2
- NIQCNGHVCWTJSM-UHFFFAOYSA-N Dimethyl phthalate Chemical compound COC(=O)C1=CC=CC=C1C(=O)OC NIQCNGHVCWTJSM-UHFFFAOYSA-N 0.000 description 2
- IAZDPXIOMUYVGZ-WFGJKAKNSA-N Dimethyl sulfoxide Chemical compound [2H]C([2H])([2H])S(=O)C([2H])([2H])[2H] IAZDPXIOMUYVGZ-WFGJKAKNSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical compound CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 2
- 239000005639 Lauric acid Substances 0.000 description 2
- 229910020038 Mg6Al2 Inorganic materials 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- 235000011054 acetic acid Nutrition 0.000 description 2
- ZOIORXHNWRGPMV-UHFFFAOYSA-N acetic acid;zinc Chemical compound [Zn].CC(O)=O.CC(O)=O ZOIORXHNWRGPMV-UHFFFAOYSA-N 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 150000007933 aliphatic carboxylic acids Chemical class 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229940116226 behenic acid Drugs 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- VSGNNIFQASZAOI-UHFFFAOYSA-L calcium acetate Chemical compound [Ca+2].CC([O-])=O.CC([O-])=O VSGNNIFQASZAOI-UHFFFAOYSA-L 0.000 description 2
- 239000001639 calcium acetate Substances 0.000 description 2
- 235000011092 calcium acetate Nutrition 0.000 description 2
- 229960005147 calcium acetate Drugs 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000007334 copolymerization reaction Methods 0.000 description 2
- FLKPEMZONWLCSK-UHFFFAOYSA-N diethyl phthalate Chemical compound CCOC(=O)C1=CC=CC=C1C(=O)OCC FLKPEMZONWLCSK-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 235000019253 formic acid Nutrition 0.000 description 2
- 239000003502 gasoline Substances 0.000 description 2
- UEGPKNKPLBYCNK-UHFFFAOYSA-L magnesium acetate Chemical compound [Mg+2].CC([O-])=O.CC([O-])=O UEGPKNKPLBYCNK-UHFFFAOYSA-L 0.000 description 2
- 239000011654 magnesium acetate Substances 0.000 description 2
- 229940069446 magnesium acetate Drugs 0.000 description 2
- 235000011285 magnesium acetate Nutrition 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 235000019260 propionic acid Nutrition 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 150000004760 silicates Chemical class 0.000 description 2
- 239000001488 sodium phosphate Substances 0.000 description 2
- 229910000162 sodium phosphate Inorganic materials 0.000 description 2
- 235000011008 sodium phosphates Nutrition 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 2
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- LWIHDJKSTIGBAC-UHFFFAOYSA-K tripotassium phosphate Chemical compound [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 description 2
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004246 zinc acetate Substances 0.000 description 2
- 229920003067 (meth)acrylic acid ester copolymer Polymers 0.000 description 1
- QMMJWQMCMRUYTG-UHFFFAOYSA-N 1,2,4,5-tetrachloro-3-(trifluoromethyl)benzene Chemical compound FC(F)(F)C1=C(Cl)C(Cl)=CC(Cl)=C1Cl QMMJWQMCMRUYTG-UHFFFAOYSA-N 0.000 description 1
- 238000005160 1H NMR spectroscopy Methods 0.000 description 1
- MEZZCSHVIGVWFI-UHFFFAOYSA-N 2,2'-Dihydroxy-4-methoxybenzophenone Chemical compound OC1=CC(OC)=CC=C1C(=O)C1=CC=CC=C1O MEZZCSHVIGVWFI-UHFFFAOYSA-N 0.000 description 1
- KGRVJHAUYBGFFP-UHFFFAOYSA-N 2,2'-Methylenebis(4-methyl-6-tert-butylphenol) Chemical compound CC(C)(C)C1=CC(C)=CC(CC=2C(=C(C=C(C)C=2)C(C)(C)C)O)=C1O KGRVJHAUYBGFFP-UHFFFAOYSA-N 0.000 description 1
- WZUNUACWCJJERC-UHFFFAOYSA-N 2,2-bis(hydroxymethyl)butyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(CC)(CO)CO WZUNUACWCJJERC-UHFFFAOYSA-N 0.000 description 1
- JZODKRWQWUWGCD-UHFFFAOYSA-N 2,5-di-tert-butylbenzene-1,4-diol Chemical compound CC(C)(C)C1=CC(O)=C(C(C)(C)C)C=C1O JZODKRWQWUWGCD-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 1
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- SIKJAQJRHWYJAI-UHFFFAOYSA-N Indole Chemical compound C1=CC=C2NC=CC2=C1 SIKJAQJRHWYJAI-UHFFFAOYSA-N 0.000 description 1
- NHTMVDHEPJAVLT-UHFFFAOYSA-N Isooctane Chemical compound CC(C)CC(C)(C)C NHTMVDHEPJAVLT-UHFFFAOYSA-N 0.000 description 1
- 229920010126 Linear Low Density Polyethylene (LLDPE) Polymers 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- BZLVMXJERCGZMT-UHFFFAOYSA-N Methyl tert-butyl ether Chemical compound COC(C)(C)C BZLVMXJERCGZMT-UHFFFAOYSA-N 0.000 description 1
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical class C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- NRCMAYZCPIVABH-UHFFFAOYSA-N Quinacridone Chemical compound N1C2=CC=CC=C2C(=O)C2=C1C=C1C(=O)C3=CC=CC=C3NC1=C2 NRCMAYZCPIVABH-UHFFFAOYSA-N 0.000 description 1
- IYFATESGLOUGBX-YVNJGZBMSA-N Sorbitan monopalmitate Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O IYFATESGLOUGBX-YVNJGZBMSA-N 0.000 description 1
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- 238000004220 aggregation Methods 0.000 description 1
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- 150000001336 alkenes Chemical class 0.000 description 1
- 150000001356 alkyl thiols Chemical class 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 125000000751 azo group Chemical group [*]N=N[*] 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- 239000003225 biodiesel Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004305 biphenyl Substances 0.000 description 1
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- OCWYEMOEOGEQAN-UHFFFAOYSA-N bumetrizole Chemical compound CC(C)(C)C1=CC(C)=CC(N2N=C3C=C(Cl)C=CC3=N2)=C1O OCWYEMOEOGEQAN-UHFFFAOYSA-N 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- FBSAITBEAPNWJG-UHFFFAOYSA-N dimethyl phthalate Natural products CC(=O)OC1=CC=CC=C1OC(C)=O FBSAITBEAPNWJG-UHFFFAOYSA-N 0.000 description 1
- JVSWJIKNEAIKJW-UHFFFAOYSA-N dimethyl-hexane Natural products CCCCCC(C)C JVSWJIKNEAIKJW-UHFFFAOYSA-N 0.000 description 1
- 229960001826 dimethylphthalate Drugs 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- YCUBDDIKWLELPD-UHFFFAOYSA-N ethenyl 2,2-dimethylpropanoate Chemical compound CC(C)(C)C(=O)OC=C YCUBDDIKWLELPD-UHFFFAOYSA-N 0.000 description 1
- UIWXSTHGICQLQT-UHFFFAOYSA-N ethenyl propanoate Chemical compound CCC(=O)OC=C UIWXSTHGICQLQT-UHFFFAOYSA-N 0.000 description 1
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 description 1
- 238000010101 extrusion blow moulding Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 229920005679 linear ultra low density polyethylene Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001386 lithium phosphate Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- QUAMTGJKVDWJEQ-UHFFFAOYSA-N octabenzone Chemical compound OC1=CC(OCCCCCCCC)=CC=C1C(=O)C1=CC=CC=C1 QUAMTGJKVDWJEQ-UHFFFAOYSA-N 0.000 description 1
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- DXGLGDHPHMLXJC-UHFFFAOYSA-N oxybenzone Chemical compound OC1=CC(OC)=CC=C1C(=O)C1=CC=CC=C1 DXGLGDHPHMLXJC-UHFFFAOYSA-N 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 150000003014 phosphoric acid esters Chemical class 0.000 description 1
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920005629 polypropylene homopolymer Polymers 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910000160 potassium phosphate Inorganic materials 0.000 description 1
- 235000011009 potassium phosphates Nutrition 0.000 description 1
- 229940114930 potassium stearate Drugs 0.000 description 1
- ANBFRLKBEIFNQU-UHFFFAOYSA-M potassium;octadecanoate Chemical compound [K+].CCCCCCCCCCCCCCCCCC([O-])=O ANBFRLKBEIFNQU-UHFFFAOYSA-M 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- RYYKJJJTJZKILX-UHFFFAOYSA-M sodium octadecanoate Chemical compound [Na+].CCCCCCCCCCCCCCCCCC([O-])=O RYYKJJJTJZKILX-UHFFFAOYSA-M 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000001570 sorbitan monopalmitate Substances 0.000 description 1
- 229940031953 sorbitan monopalmitate Drugs 0.000 description 1
- 235000011071 sorbitan monopalmitate Nutrition 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- UEUXEKPTXMALOB-UHFFFAOYSA-J tetrasodium;2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxylatomethyl)amino]acetate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UEUXEKPTXMALOB-UHFFFAOYSA-J 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- TWQULNDIKKJZPH-UHFFFAOYSA-K trilithium;phosphate Chemical compound [Li+].[Li+].[Li+].[O-]P([O-])([O-])=O TWQULNDIKKJZPH-UHFFFAOYSA-K 0.000 description 1
- 229920001866 very low density polyethylene Polymers 0.000 description 1
- UKRDPEFKFJNXQM-UHFFFAOYSA-N vinylsilane Chemical class [SiH3]C=C UKRDPEFKFJNXQM-UHFFFAOYSA-N 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Classifications
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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B32B1/00—Layered products having a non-planar shape
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- B32B27/00—Layered products comprising a layer of synthetic resin
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
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- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
- B32B2250/246—All polymers belonging to those covered by groups B32B27/32 and B32B27/30
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
- B32B2264/10—Inorganic particles
- B32B2264/102—Oxide or hydroxide
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- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
- B32B2264/10—Inorganic particles
- B32B2264/104—Oxysalt, e.g. carbonate, sulfate, phosphate or nitrate particles
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2272/00—Resin or rubber layer comprising scrap, waste or recycling material
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/558—Impact strength, toughness
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
- B32B2307/7244—Oxygen barrier
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/726—Permeability to liquids, absorption
- B32B2307/7265—Non-permeable
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/40—Closed containers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K15/03177—Fuel tanks made of non-metallic material, e.g. plastics, or of a combination of non-metallic and metallic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K2015/03486—Fuel tanks characterised by the materials the tank or parts thereof are essentially made from
- B60K2015/03493—Fuel tanks characterised by the materials the tank or parts thereof are essentially made from made of plastics
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
- Y10T428/1379—Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
Definitions
- the present invention relates to a fuel container that is excellent in fuel barrier properties and impact resistance, and that enables stable production.
- Patent Document 1 a method of forming a multilayer including an ethylene-vinyl alcohol copolymer (which may be hereinafter abbreviated as EVOH) layer and a polyolefin layer is known. Further, in fuel containers having an EVOH layer and a polyolefin layer, a fuel container in which the EVOH layer is disposed on the inner side in order to improve the fuel barrier properties is also known (Patent Document 2).
- EVOH ethylene-vinyl alcohol copolymer
- Patent Document 2 a fuel container in which the EVOH layer is disposed on the inner side in order to improve the fuel barrier properties.
- the present invention has been devised in order to solve the aforementioned problem, and it is an object of the present invention to provide a fuel container that is excellent in fuel barrier properties and impact resistance, and that enables stable production.
- a fuel container composed of a multilayer structure containing: an EVOH (A) layer; an adhesive resin (B) layer; a high-density polyethylene (C) layer; and a resin composition (D) layer, wherein the EVOH (A) contains 15 to 44 mol % of ethylene, the adhesive resin (B) is a maleic anhydride-modified polyolefin having an acid value of 0.1 to 10 mgKOH/g and containing 1 to 8.5 ⁇ mol/g of magnesium element, calcium element, zinc element, or a combination thereof, the resin composition (D) contains the EVOH (A), the adhesive resin (B), and the high-density polyethylene (C), and the fuel container satisfies formulas (1) to (6) below.
- Ma, Mb, and Mc are respectively as follows: Ma represents a MFR (g/10 min) of the EVOH (A) (measured at 210° C. under a load of 2160 g); Mb represents a MFR (g/10 min) of the adhesive resin (B) (measured at 210° C. under a load of 2160 g); and Mc represents a MFR (g/10 min) of the high-density polyethylene (C) (measured at 210° C. under a load of 2160 g).
- Ta represents the total thickness of the (A) layer
- Tb represents the total thickness of the (B) layer
- Tc represents the total thickness of the (C) layer
- Td represents the total thickness of the (D) layer
- Tt represents the overall thickness (Ta+Tb+Tc+Td).
- the resin composition (D) contains 1 to 20 mass % of the EVOH (A), 1 to 20 mass % of the adhesive resin (B), and 60 to 98 mass % of the high-density polyethylene (C). It is also suitable that the resin composition (D) contains 0.001 to 1 ⁇ mol/g of magnesium element, calcium element, zinc element, or a combination thereof. It is also suitable that the resin composition (D) contains 0.001 to 5 ⁇ mol/g of an alkali metal element.
- the fuel container satisfies formula (7) below. 0.3 ⁇ ( VA ⁇ Ta )/( MT ⁇ Tb ) ⁇ 1000 (7)
- the EVOH (A) contains 0.04 to 13 ⁇ mol/g of an alkali metal element.
- the adhesive resin (B) contains 0.35 to 11.5 ⁇ mol/g of aluminum element and 0.5 ⁇ mol/g or less of titanium element.
- the total amount of magnesium element, calcium element, and zinc element in the high-density polyethylene (C) is 0.5 ⁇ mol/g or less.
- the EVOH (A) layer and the adhesive resin (B) layer are in contact with each other in the fuel container.
- the fuel container of the present invention is excellent in fuel barrier properties and impact resistance. Further, even in the case where molding of the fuel container of the present invention is continued over a long period of time, generation of foreign matter derived from the EVOH (A) in the resin composition (D) is suppressed. Accordingly, the fuel container of the present invention is stably produced and thus is excellent in productivity.
- the fuel container of the present invention is a fuel container composed of a multilayer structure containing an EVOH (A) layer, an adhesive resin (B) layer, a high-density polyethylene (C) layer, and a resin composition (D) layer, wherein the EVOH (A) contains 15 to 44 mol % of ethylene, the adhesive resin (B) is a maleic anhydride-modified polyolefin having an acid value of 0.1 to 10 mgKOH/g and containing 1 to 8.5 ⁇ mol/g of magnesium element, calcium element, zinc element, or a combination thereof, the resin composition (D) contains the EVOH (A), the adhesive resin (B), and the high-density polyethylene (C), and the fuel container satisfies formulas (1) to (6) below.
- Ma, Mb, and Mc are respectively as follows: Ma represents the MFR (g/10 min) of the EVOH (A) (measured at 210° C. under a load of 2160 g); Mb represents the MFR (g/10 min) of the adhesive resin (B) (measured at 210° C. under a load of 2160 g); and Mc represents the MFR (g/10 min) of the high-density polyethylene (C) (measured at 210° C. under a load of 2160 g).
- Ta represents the total thickness of the (A) layer
- Tb represents the total thickness of (B) layer
- Tc represents the total thickness of the (C) layer
- Td represents the total thickness of the (D) layer
- Tt represents the overall thickness (Ta+Tb+Tc+Td).
- the EVOH (A) used in the present invention is obtained by saponification of an ethylene-vinyl ester copolymer.
- the vinyl ester is typified by vinyl acetate, but other fatty acid vinyl esters (such as vinyl propionate and vinyl pivalate) also can be used.
- the ethylene content of the EVOH (A) is 15 to 44 mol %. In the case where the ethylene content of the EVOH (A) is less than 15 mol %, the productivity of the fuel container decreases.
- the ethylene content of the EVOH (A) is preferably 18 mol % or more. Meanwhile, in the case where the ethylene content of the EVOH (A) is over 44 mol %, the fuel barrier properties are insufficient.
- the ethylene content of the EVOH (A) is preferably 38 mol % or less, more preferably 35 mol % or less. Further, the saponification degree of the vinyl ester component of the EVOH (A) is preferably 90% or more, more preferably 95% or more, further preferably 99% or more. When the saponification degree is less than 90 mol %, the fuel barrier properties may possibly be insufficient.
- the ethylene content and the saponification degree of the EVOH (A) can be determined by the nuclear magnetic resonance (NMR) technique.
- the EVOH (A) may be obtained by copolymerization of monomers other than ethylene, vinyl alcohol, and vinyl ester, as long as the object of the present invention is not inhibited.
- the copolymerizable monomers include ⁇ -olefins such as propylene, 1-butene, isobutene, 4-methyl-1-pentene, 1-hexene, and 1-octene; unsaturated carboxylic acids such as itaconic acid, methacrylic acid, acrylic acid, and maleic anhydride, salts thereof, partial or complete esters thereof, nitriles thereof, amides thereof, and anhydrides thereof; vinyl silane compounds such as vinyltrimethoxysilane; unsaturated sulfonic acids or salts thereof; alkylthiols; and vinyl pyrrolidones.
- the content of monomer units other than ethylene units, vinyl alcohol units, and vinyl ester units in the EVOH (A) is generally 10 mol % or less, suit
- the EVOH (A) suitably contains 0.1 to 4.5 ⁇ mol/g of magnesium element, calcium element, zinc element, or a combination thereof. This further suppresses the deterioration of the EVOH (A), thereby further reducing the foreign matter derived from the EVOH (A) in the resin composition (D) in the case where the production of the fuel container is continued over a long period of time. Accordingly, further stable production of the fuel container is enabled.
- the total amount of magnesium element, calcium element, and zinc element in the EVOH (A) is more suitably 0.5 ⁇ mol/g or more, further suitably 1 ⁇ mol/g or more. Meanwhile, the total amount is more suitably 3 ⁇ mol/g or less, further suitably 2 ⁇ mol/g or less.
- the molar ratio of magnesium element with respect to the total of magnesium element, calcium element, and zinc element in the EVOH (A) is more suitably 0.5 or more, further suitably 0.8 or more.
- the forms of magnesium element, calcium element, and zinc element contained in the EVOH (A) are not specifically limited, and examples thereof include metal salts and metal oxides. Among these, metal salts are preferable. Examples of the metal salts include aliphatic carboxylates, aromatic carboxylates, phosphates, carbonates, sulfates, and silicates, and double salts also can be used as the metal salts. Among these, aliphatic carboxylates are preferable as the metal salts.
- carboxylic acids constituting the aliphatic carboxylates include aliphatic carboxylic acids having 1 to 28 carbon atoms such as formic acid, acetic acid, propionic acid, butyric acid, lauric acid, stearic acid, myristic acid, behenic acid, and montanic acid. Further, use of the double salts as the metal salts is also preferable, and hydrotalcites are more preferable. As the hydrotalcites, those described below as hydrotalcites contained in the adhesive resin (B) can be mentioned.
- the EVOH (A) contains 0.04 to 13 ⁇ mol/g of alkali metal elements. This accelerates the reaction of the EVOH (A) with the adhesive resin (B) to further improve the dispersibility of the EVOH (A) in the resin composition (D) layer. Further, the foreign matter derived from the EVOH (A) when the production of the fuel container is continued over a long period of time is further reduced. Accordingly, further stable production of the fuel container is enabled. In the case where the content of alkali metal elements in the EVOH (A) is less than 0.04 ⁇ mol/g, the aforementioned effects cannot be obtained.
- the content of alkali metal elements is more suitably 0.5 ⁇ mol/g or more, further suitably 1 ⁇ mol/g or more. Meanwhile, in the case where the content of alkali metal elements is over 13 ⁇ mol/g, the EVOH (A) easily deteriorates, and the foreign matter may possibly increase.
- the content of alkali metal elements is more suitably 10.5 ⁇ mol/g or less.
- alkali metal elements contained in the EVOH (A) include sodium, potassium, and lithium.
- the forms of these alkali metal elements are not specifically limited, and examples thereof include alkali metal salts such as aliphatic carboxylates, aromatic carboxylates, phosphates, metal complexes.
- alkali metal salts include sodium acetate, potassium acetate, sodium phosphate, potassium phosphate, lithium phosphate, sodium stearate, potassium stearate, and the sodium salt of ethylenediaminetetraacetic acid. Among these, sodium acetate, potassium acetate, and sodium phosphate are suitable.
- the EVOH (A) may further contain boron compounds, phosphate compounds, and the like. Addition of boron compounds can improve the melt viscosity of the EVOH (A). Further, addition of phosphate compounds can suppress coloration of molded products. Generally, the content of boron compounds is 20 to 2000 ppm in terms of boron element, and the content of phosphate compounds is 10 to 500 ppm in terms of phosphate radical.
- EVOH (A) may contain various additives.
- additives include antioxidants, plasticizers, heat stabilizers, ultraviolet absorbers, antistatic agents, lubricants, coloring agents, fillers, and other resins, and specific examples thereof are as follows.
- the content of these additives in the EVOH (A) is generally 10 mass % or less, suitably 5 mass % or less, more suitably 1 mass % or less.
- Antioxidants 2,5-di-t-butyl hydroquinone, 2,6-di-t-butyl-p-cresol, 4,4′-thiobis-(6-t-butylphenol), 2,2′-methylene-bis-(4-methyl-6-t-butylphenol), octadecyl-3-(3′,5′-di-t-butyl-4′-hydroxyphenyl) propionate, 4,4′-thiobis-(6-t-butylphenol), and the like.
- Ultraviolet absorbers ethylene-2-cyano-3,3′-diphenyl acrylate, 2-(2′-hydroxy-5′-methylphenyl) benzotriazole, 2-(2′-hydroxy-5′-methylphenyl) benzotriazole, 2-(2′-hydroxy-5′-methylphenyl) benzotriazole, 2-(2′-hydroxy-3′-t-butyl-5′-methylphenyl)5-chlorobenzotriazole, 2-hydroxy-4-methoxybenzophenone, 2,2′-dihydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, and the like.
- Plasticizers dimethyl phthalate, diethyl phthalate, dioctyl phthalate, waxes, liquid paraffins, phosphate esters, and the like.
- Antistatic agents pentaerythritol monostearate, sorbitan monopalmitate, sulfated polyolefins, polyethylene oxides, carbowaxes, and the like.
- Lubricants ethylenebisstearamide, butyl stearate, and the like.
- Coloring agents carbon black, phthalocyanine, quinacridone, indoline, azo pigments, colcothar, and the like.
- Fillers glass fibers, asbestos, wollastonite, calcium silicate, talc, montmorillonite, and the like.
- the MFR (melt flow rate) of the EVOH (A) used in the present invention is suitably 1 to 18 g/10 min.
- the difference in melt viscosity between the EVOH (A) and the adhesive resin (B) and the difference in melt viscosity between the EVOH (A) and the high-density polyethylene (C) may possibly be excessively large.
- the MFR of the EVOH (A) is more suitably 10 g/10 min or less. Meanwhile, in the case where the MFR of the EVOH (A) is less than 1 g/10 min, the difference in melt viscosity between the EVOH (A) and the adhesive resin (B) may possibly be excessively large.
- the MFR of the EVOH (A) is more suitably 1.5 g/10 min or more.
- the maleic anhydride-modified polyolefin used as the adhesive resin (B) can be obtained, for example, by graft modification of a polyolefin with maleic anhydride or copolymerization of an olefin with maleic anhydride.
- maleic anhydride-modified polyolefin used as the adhesive resin (B) examples include maleic anhydride-modified products of polyethylenes [such as high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and ultra-low-density polyethylene (VLDPE)], homo-polypropylene, random polypropylene, block polypropylene, ethylene-vinyl acetate copolymer, and ethylene-(meth)acrylic acid ester copolymer.
- polyethylenes such as high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and ultra-low-density polyethylene (VLDPE)
- homo-polypropylene random polypropylene
- block polypropylene block polypropylene
- ethylene-vinyl acetate copolymer ethylene-(meth)acrylic acid ester copo
- maleic anhydride-modified products of high-density polyethylene, linear low-density polyethylene, and low-density polyethylene are suitable, and maleic anhydride-modified products of high-density polyethylene are particularly suitable.
- the acid value of the maleic anhydride-modified polyolefin used as the adhesive resin (B) needs to be 0.1 to 10 mgKOH/g. This accelerates the reaction of the EVOH (A) with the adhesive resin (B) to improve the dispersibility of the EVOH (A) in the resin composition (D) layer.
- the improvement of the dispersibility of the EVOH (A) reduces the foreign matter derived from the EVOH (A) in the resin composition (D) layer when the production of the fuel container is continued over a long period of time and enables stable production of the fuel container.
- the acid value is less than 0.1 mgKOH/g, the dispersibility of the EVOH (A) is insufficient, and therefore the foreign matter increases.
- the acid value is suitably 0.5 mgKOH/g or more. Meanwhile, in the case where the acid value is over 10 mgKOH/g, the EVOH (A) easily deteriorates, and therefore the foreign matter increases.
- the acid value is suitably 6 mgKOH/g or less.
- the maleic anhydride-modified polyolefin used as the adhesive resin (B) needs to contain 1 to 8.5 ⁇ mol/g of magnesium element, calcium element, zinc element, or a combination thereof. This suppresses the deterioration of the EVOH (A), thereby reducing the foreign matter derived from the EVOH (A) in the resin composition (D) when the production of the fuel container is continued over a long period of time. Accordingly, stable production of the fuel container is enabled.
- the total amount of magnesium element, calcium element, and zinc element in the adhesive resin (B) is less than 1 ⁇ mol/g, the EVOH (A) easily deteriorates, and therefore the foreign matter increases.
- the the total amount is suitably 1.2 ⁇ mol/g or more.
- the total amount of magnesium element, calcium element, and zinc element is over 8.5 ⁇ mol/g
- degradation of the EVOH (A) proceeds to increase the difference in viscosity from the high-density polyethylene (C). Therefore, the degraded EVOH (A) is poorly dispersed in the resin composition (D) to form foreign matter.
- the total amount is suitably 6.5 ⁇ mol/g or less.
- the molar ratio of magnesium element with respect to the total of magnesium element, calcium element, and zinc element in the adhesive resin (B) is more suitably 0.5 or more, further suitably 0.8 or more.
- the forms of magnesium element, calcium element, and zinc element contained in the adhesive resin (B) are not specifically limited, and examples thereof include metal salts and metal oxides.
- metal salts are preferable.
- the metal salts include aliphatic carboxylates, aromatic carboxylates, phosphates, carbonates, sulfates, and silicates, and double salts also can be used as the metal salts.
- double salts and aliphatic carboxylates are preferable as the metal salts, and the former is more preferable.
- hydrotalcites are preferable, and specific examples thereof include those represented by the following formula. m x Al y (OH) 2x+3y-2z ( b ) z .a H 2 O
- m represents one or more of Mg, Ca, and Zn, or a combination of one or more of Mg, Ca, and Zn with one or more of Sr, Ba, Cd, Pb, and Sn
- b represents CO 3 or HPO 4
- x, y, and z each represent a positive number
- a represents 0 or a positive number
- hydrotalcites represented by the aforementioned formula those with m being one or more of Mg, Ca, and Zn are preferable, and the following hydrotalcites are particularly suitable.
- Mg 6 Al 2 (OH) 16 CO 3 .4H 2 O Mg 8 Al 2 (OH) 20 CO 3 .5H 2 O Mg 5 Al 2 (OH) 14 CO 3 .4H 2 O Mg 10 Al 2 (OH) 22 (CO 3 ) 2 .4H 2 O Mg 6 Al 2 (OH) 16 HPO 4 .4H 2 O
- examples of the carboxylic acids constituting the aliphatic carboxylates include aliphatic carboxylic acids having 1 to 28 carbon atoms such as formic acid, acetic acid, propionic acid, butyric acid, lauric acid, stearic acid, myristic acid, behenic acid, and montanic acid.
- the content of aluminum element is 0.35 to 11.5 ⁇ mol/g, and the content of titanium element is 0.5 ⁇ mol/g or less.
- the EVOH (A) easily deteriorates, and foreign matter in the resin composition (D) may possibly increase.
- the content of aluminum element is more suitably 1.5 ⁇ mol/g or more.
- compounds containing aluminum element form foreign matter due to aggregation or the like, and the impact resistance may possibly decrease.
- the content of aluminum element is more suitably 8 ⁇ mol/g or less, further suitably 5 ⁇ mol/g or less.
- Aluminum element can be contained in the adhesive resin (B) as hydrotalcites or the like. Further, titanium element may be contained in the adhesive resin (B) due to a catalyst or the like used in the production of the adhesive resin (B) remaining there in some cases.
- the adhesive resin (B) may contain various additives.
- additives can include antioxidants, plasticizers, heat stabilizers, ultraviolet absorbers, antistatic agents, lubricants, coloring agents, fillers, and other resins. Specific examples thereof include those described above as the additives used for the EVOH (A).
- the content of these additives in the adhesive resin (B) is generally 10 mass % or less, suitably 5 mass % or less, more suitably 1 mass % or less.
- the MFR (melt flow rate) of the adhesive resin (B) is suitably 0.5 to 12 g/10 min.
- the difference in melt viscosity between the adhesive resin (B) and the high-density polyethylene (C) may possibly be excessively large.
- the difference in melt viscosity is excessively large as above, the dispersibility of the EVOH (A) in the resin composition (D) layer is insufficient, and the foreign matter derived from the EVOH (A) may possibly increase.
- the MFR of the adhesive resin (B) is more suitably 10 g/10 min or less. Meanwhile, the MFR of the adhesive resin (B) is more suitably 1 g/10 min or more.
- the high-density polyethylene (C) used in the present invention can be obtained, for example, by the low-pressure process or the medium-pressure process using a Ziegler catalyst.
- the density of the high-density polyethylene (C) is generally 0.92 g/cm 3 or more, suitably 0.93 g/cm 3 or more. In the case where the density is less than 0.92 g/cm 3 , the fuel barrier properties and the rigidity of the fuel container are insufficient.
- the density of the high-density polyethylene (C) is generally 1.00 g/cm 3 or less.
- the total amount of magnesium element, calcium element, and zinc element in the high-density polyethylene (C) is suitably 0.5 ⁇ mol/g or less. In the case where the total amount is over 0.5 ⁇ mol/g, the foreign matter derived from the EVOH (A) in the resin composition (D) may possibly increase. The total amount is more suitably 0.3 ⁇ mol/g or less.
- the high-density polyethylene (C) may contain various additives.
- additives can include antioxidants, plasticizers, heat stabilizers, ultraviolet absorbers, antistatic agents, lubricants, coloring agents, fillers, and other resins, and specific examples thereof include those described above as the additives used for the EVOH (A).
- the content of these additives in the high-density polyethylene (C) is generally 10 mass % or less, suitably 5 mass % or less, more suitably 1 mass % or less.
- the MFR (melt flow rate) of the high-density polyethylene (C) is suitably 0.01 to 0.3 g/10 min.
- the difference in melt viscosity between the EVOH (A) and the high-density polyethylene (C) and the difference in melt viscosity between the adhesive resin (B) and the high-density polyethylene (C) may possibly be excessively large.
- the MFR of the high-density polyethylene (C) is more suitably 0.03 g/10 min or more. Meanwhile, in the case where the MFR of the high-density polyethylene (C) is over 0.3 g/10 min, the formability may decrease in some cases.
- the MFR of the EVOH (A) is more suitably 0.2 g/10 min or less.
- the EVOH (A), the adhesive resin (B), and the high-density polyethylene (C) used for the fuel container of the present invention need to satisfy formulas (1) to (2) below.
- Ma, Mb, and Mc are respectively as follows: Ma represents the MFR (g/10 min) of the EVOH (A) (measured at 210° C. under a load of 2160 g); Mb represents the MFR (g/10 min) of the adhesive resin (B) (measured at 210° C. under a load of 2160 g); and Mc represents the MFR (g/10 min) of the high-density polyethylene (C) (measured at 210° C. under a load of 2160 g).
- the dispersibility of the EVOH (A) in the resin composition (D) layer is insufficient, and the foreign matter derived from the EVOH (A) increases.
- Ma/Mb is suitably 0.5 or more. Meanwhile, the Ma/Mb is suitably 20 or less, more suitably 8 or less.
- Ma/Mc is 2 or more.
- the high-density polyethylene has a high melt viscosity, and there is a large difference in melt viscosity between the high-density polyethylene and the EVOH. Therefore, in the case where the high-density polyethylene and the EVOH are melt-kneaded, the EVOH tends to be poorly dispersed. When the dispersion of the EVOH is poor, foreign matter derived from the EVOH occurs.
- the EVOH (A) is sufficiently dispersed in the resin composition (D) in the present invention, even in the case where the difference in melt viscosity between the high-density polyethylene (C) having a high melt viscosity and the EVOH (A) is large as above. Accordingly, the foreign matter derived from the EVOH (A) is reduced.
- Ma/Mc is suitably 10 or more. Meanwhile, in the case where Ma/Mc is over 1800, the difference in melt viscosity between the EVOH (A) and the high-density polyethylene (C) is excessively large, and the dispersibility of the EVOH (A) in the resin composition (D) layer is insufficient, so that foreign matter increases.
- Ma/Mc is suitably 1500 or less.
- the adhesive resin (B) and the high-density polyethylene (C) used for the fuel container of the present invention suitably satisfy formula (8) below. 2 ⁇ Mb/Mc ⁇ 1000 (8)
- Mb and Mc are the same as in formulas (1) and (2) above.
- the difference in melt viscosity between the adhesive resin (B) and the high-density polyethylene (C) may possibly be excessively large.
- the difference in melt viscosity is excessively large, the dispersibility of the EVOH (A) in the resin composition (D) layer is insufficient, and the foreign matter derived from the EVOH (A) may possibly increase.
- the Mb/Mc is more suitably 10 or more.
- the resin composition (D) used in the present invention contains the EVOH (A), the adhesive resin (B), and the high-density polyethylene (C).
- the content of the EVOH (A) in the resin composition (D) is suitably 1 to 20 mass %. In the case where the content of the EVOH (A) is less than 1 mass %, the usage ratio of recovered materials may possibly decrease. Meanwhile, in the case where the content of the EVOH (A) is over 20 mass %, the impact resistance may possibly decrease.
- the content of the adhesive resin (B) in the resin composition (D) is suitably 1 to 20 mass %. In the case where the content of the adhesive resin (B) is less than 1 mass %, the dispersibility of the EVOH (A) decreases, and the foreign matter derived from the EVOH (A) in the resin composition (D) may possibly increase. Meanwhile, in the case where the content of the adhesive resin (B) is over 20 mass %, the reaction of the EVOH (A) with the adhesive resin (B) excessively proceeds, and the foreign matter may possibly increase.
- the content of the adhesive resin (B) is more suitably 15 mass % or less.
- the content of the high-density polyethylene (C) in the resin composition (D) is suitably 60 to 98 mass %. In the case where the content of the high-density polyethylene (C) is less than 60 mass %, the impact resistance may possibly decrease. Meanwhile, in the case where the content of the high-density polyethylene (C) is over 98 mass %, the usage ratio of recovered materials may possibly decrease.
- the high-density polyethylene (C) is more suitably 95 mass % or less.
- the foreign matter derived from the EVOH (A) further decreases, and further stable production of the fuel container is enabled.
- the resin composition (D) contains 0.001 to 1 ⁇ mol/g of magnesium element, calcium element, zinc element, or a combination thereof. This further suppresses the deterioration of the EVOH (A), and therefore the foreign matter derived from the EVOH (A) in the resin composition (D) is further reduced when the production of the fuel container is continued over a long period of time. Accordingly, further stable production of the fuel container is enabled.
- the total amount of magnesium element, calcium element, and zinc element is more suitably 0.1 ⁇ mol/g or more. Meanwhile, the total amount of magnesium element, calcium element, and zinc element is more suitably 0.6 ⁇ mol/g or less, further suitably 0.4 ⁇ mol/g or less.
- the resin composition (D) contains 0.001 to 5 ⁇ mol/g of alkali metal elements. This accelerates the reaction of the EVOH (A) with the adhesive resin (B), and the dispersibility of the EVOH (A) in the resin composition (D) layer is further improved. This further reduces the foreign matter derived from the EVOH (A) when the production of the fuel container is continued over a long period of time, and further stable production of the fuel container is enabled.
- the content of alkali metal elements in the resin composition (D) is less than 0.001 ⁇ mol/g, the aforementioned effects cannot be obtained.
- the content of alkali metal elements is more suitably 0.2 ⁇ mol/g or more.
- the EVOH (A) easily deteriorates, and the foreign matter may possibly increase.
- the content of alkali metal elements is more suitably 2 ⁇ mol/g or less.
- the resin composition (D) may contain various additives.
- additives can include antioxidants, plasticizers, heat stabilizers, ultraviolet absorbers, antistatic agents, lubricants, coloring agents, fillers, and resins other than the EVOH (A), the adhesive resin (B), and the high-density polyethylene (C), and specific examples thereof include those described above as the additives used for the EVOH (A).
- the content of these additives in the resin composition (D) is generally 10 mass % or less, suitably 5 mass % or less, more suitably 1 mass % or less.
- the raw materials of the resin composition (D) only unused resins may be used, but recovered materials such as scraps, e.g., burrs generated during production of the fuel container of the present invention and rejected items during molding are preferably used as at least a part of the raw materials.
- the amount of the recovered materials in the resin composition (D) is suitably 50 mass % or more.
- the fuel container of the present invention is composed of a multilayer structure containing the EVOH (A) layer, the adhesive resin (B) layer, the high-density polyethylene (C) layer, and the resin composition (D) layer.
- the multilayer structure include the following layer structures. In these examples, the left side represents the inner side of the fuel container, and the right side represents the outer side thereof.
- the layer structure is not limited to the aforementioned examples. Among these, (inner side) C/B/NB/D/C (outer side) and (inner side) C/D/B/A/B/D/C (outer side) are suitable, and the former is more suitable. Further, the EVOH (A) layer and the adhesive resin (B) layer are suitably in contact with each other in the multilayer structure. This improves the adhesiveness between layers constituting the multilayer structure, therefore improving the mechanical strength of the fuel container.
- the thickness of the EVOH (A) layer is suitably 20 to 300 ⁇ m. In the case where the thickness of the EVOH (A) layer is less than 20 ⁇ m, the fuel barrier properties may possibly be insufficient. Meanwhile, in the case where the thickness of the EVOH (A) layer is over 300 ⁇ m, the impact resistance may possibly decrease, or the cost may possibly be high.
- the thickness of the adhesive resin (B) layer is suitably 4 to 300 ⁇ m. In the case where the thickness of the adhesive resin (B) layer is less than 4 ⁇ m, the dispersibility of the EVOH (A) is insufficient, and foreign matter may possibly increase, when recovered materials are used as raw materials of the resin composition (D).
- the thickness of the adhesive resin (B) layer is more suitably 7 ⁇ m or more. Meanwhile, in the case where the thickness of the adhesive resin (B) layer is over 300 ⁇ m, the reaction of the EVOH (A) with the adhesive resin (B) excessively proceeds, and foreign matter may possibly increase, when recovered materials are used as raw materials of the resin composition (D).
- the thickness of the adhesive resin (B) layer is more suitably 250 ⁇ m or less.
- the thickness of the high-density polyethylene (C) layer is suitably 300 to 3000 ⁇ m. In the case where the thickness of the high-density polyethylene (C) layer is less than 300 ⁇ m, the impact resistance may possibly decrease.
- the thickness of the high-density polyethylene (C) layer is more suitably 350 ⁇ m or more. Meanwhile, in the case where the thickness of the high-density polyethylene (C) layer is over 3000 ⁇ m, the fuel container may possibly be excessively heavy, and the cost may possibly be high.
- the thickness of the adhesive resin (B) layer is more suitably 2500 ⁇ m or less.
- the thickness of the resin composition (D) layer is suitably 100 to 20000 ⁇ m. In the case where the thickness of the resin composition (D) layer is less than 100 ⁇ m, the cost may possibly be high.
- the thickness of the resin composition (D) layer is suitably 200 ⁇ m or more. Meanwhile, in the case where the thickness of the resin composition (D) layer is over 20000 ⁇ m, the impact resistance may possibly decrease.
- the thickness of the resin composition (D) layer is suitably 10000 ⁇ m or less.
- the overall thickness of the multilayer structure constituting the fuel container of the present invention can be appropriately set corresponding to the volume and the application.
- the overall thickness is generally 500 to 50000 ⁇ m. In the case where the overall thickness is less than 500 ⁇ m, the mechanical strength of the fuel container may possibly be insufficient.
- the overall thickness is suitably 1000 ⁇ m or more. Meanwhile, in the case where the overall thickness is over 50000 ⁇ m, the fuel container may possibly be excessively heavy, and the cost may possibly be high.
- the overall thickness is suitably 8500 ⁇ m or less, more suitably 7000 ⁇ m or less.
- the thickness of each layer and the overall thickness of the multilayer structure can be determined by measuring the cross section of the body of the fuel container. Specifically, they are average values obtained by cutting the container in a direction rectangular to the flow direction, measuring the cross section of the entire circumference of the cut surface at 30 random points, and thereafter subtracting the average values ⁇ 1 ⁇ from the obtained values.
- the fuel container of the present invention needs to satisfy formulas (3) to (6) below. 0.003 ⁇ Ta/Tt ⁇ 0.12 (3) 0.0015 ⁇ Tb/Tt ⁇ 0.12 (4) 0.83 ⁇ ( Tc+Td )/ Tt ⁇ 0.99 (5) 0.02 ⁇ Td /( Tc+Td ) ⁇ 0.90 (6)
- Ta represents the total thickness of the (A) layer
- Tb represents the total thickness of (B) layer
- Tc represents the total thickness of the (C) layer
- Td represents the total thickness of the (D) layer
- Tt represents the overall thickness (Ta+Tb+Tc+Td).
- Ta/Tt in formula (3) above is less than 0.003, the fuel barrier properties may possibly decrease.
- Ta/Tt is suitably 0.008 or more.
- the impact resistance decreases.
- Ta/Tt is suitably 0.10 or less.
- Tb/Tt in formula (4) above is less than 0.0015, the dispersibility of the EVOH (A) is insufficient, and the foreign matter derived from the EVOH (A) increases, when recovered materials are used as raw materials of the resin composition (D).
- Tb/Tt is suitably 0.004 or more.
- Tb/Tt is over 0.12, the reaction of the EVOH (A) with the adhesive resin (B) excessively proceeds, and foreign matter may possibly increase in some cases, when recovered materials are used as raw materials of the resin composition (D).
- (Tc+Td)/Tt indicates the ratio of the total thickness of the high-density polyethylene (C) layer and the resin composition (D) layer with respect to the overall thickness of the fuel container.
- (Tc+Td)/Tt is less than 0.83, the impact resistance decreases. Meanwhile, in the case where (Tc+Td)/Tt is over 0.99, the fuel barrier properties may possibly decrease.
- Td/(Tc+Td) indicates the ratio of the total thickness of the resin composition (D) layer with respect to the total thickness of the high-density polyethylene (C) layer and the resin composition (D) layer.
- Td/(Tc+Td) is less than 0.02
- the cost is high.
- Td/(Tc+Td) is suitably 0.2 or more.
- Td/(Tc+Td) is over 0.90, the impact resistance decreases.
- Td/(Tc+Td) is suitably 0.83 or less.
- Ta and Tb are the same as in formulas (3) and (4) above.
- (VA ⁇ Ta)/(MT ⁇ Tb) in formula (7) above is less than 0.3, the total number of moles of magnesium element, calcium element, and zinc element with respect to the number of moles of vinyl alcohol units in the resin composition (D) may possibly be excessively large, when recovered materials are used as raw materials of the resin composition (D). Therefore, the reaction of the EVOH (A) with the adhesive resin (B) excessively proceeds, and foreign matter may possibly increase.
- (VA ⁇ Ta)/(MT ⁇ Tb) is suitably 0.5 or more.
- (VA ⁇ Ta)/(MT ⁇ Tb) is over 1000
- the total number of moles of magnesium element, calcium element, and zinc element with respect to the number of moles of vinyl alcohol units in the resin composition (D) may possibly be excessively small, when recovered materials are used as raw materials of the resin composition (D). Therefore, the dispersibility of the EVOH (A) decreases, and foreign matter may possibly increase.
- (VA ⁇ Ta)/(MT ⁇ Tb) is suitably 400 or less.
- the method for producing the fuel container of the present invention is not specifically limited. Examples thereof can include forming methods that are generally used in the field of polyolefins, such as extrusion molding, blow molding, injection molding, and thermoforming. Among these, blow molding and thermoforming are suitable, coextrusion blow molding and coextrusion sheet thermoforming are particularly suitable, and the former is optimal.
- coextrusion blow molding In the case of producing the fuel container by blow molding, any method of coextrusion blow molding and coinjection blow molding can be employed, but coextrusion blow molding, which enables easy formation of complex shapes of containers, is suitable.
- coextrusion blow molding a parison is formed by melt extrusion, the parison is sandwiched by a pair of blow molding dies, so that the parison is cut off while the cut-off portions facing each other are fused. The parison that has been cut off is then formed into a container by being expanded in the mold.
- the parison is sandwiched between the dies, and pressure bonding is performed, but it is not cut off in the dies, and the portion protruding from the surface of the container is usually cut off with a cutter or the like at any height.
- the die temperature for blow molding the fuel container of the present invention is suitably 5 to 30° C., more preferably 10 to 30° C., further preferably 10 to 20° C.
- the die temperature is less than 5° C.
- condensation tends to occur on the die surfaces, and the appearance of molded products may possibly be poor.
- the productivity may possibly decrease due to an increase in the time to cool the resin, and in the case where the resin cannot be sufficiently cooled, distortion may possibly occur in molded products.
- the obtained molded products and container precursors such as a parison and sheets in the course of molding may be subjected to crosslinking by irradiation with radiation or the like.
- the fuel container in the present invention means fuel containers mounted on automobiles, motorcycles, ships, aircrafts, power generators, and industrial and agricultural equipment, or portable containers for supplying fuel to these fuel containers, and further containers for storing fuel used for operating these appliances.
- typical examples of the fuel include regular gasoline, methanol, ethanol, gasoline blending toluene, MTBE, or the like and biodiesel fuel, and the examples also include heavy oil, light oil, and kerosene other than above.
- the solution obtained was subjected to 1 H-NMR measurement using a nuclear magnetic resonance apparatus “JNM-GX-500”, manufactured by JEOL Ltd., to determine the ethylene content and the saponification degree of the EVOH.
- the MFR of the resin was measured at 210° C. under a load of 2160 g based on JIS K 7210.
- the acid value of the adhesive resin was determined based on the neutralization titration method of JIS K 0070. Xylene was used as a solvent.
- aqueous pellets 100 parts by mass of aqueous pellets (moisture content: 50%) composed of an EVOH with an ethylene content of 32 mol % and a saponification degree of 99.99% was immersed in 400 parts by mass of an aqueous solution containing 0.02 g/L of magnesium acetate, 0.025 g/L of sodium acetate, and 0.1 g/L of potassium acetate at 25° C. for 6 hours. After dewatering, drying was performed, to obtain pellets of the EVOH (A1).
- Table 1 shows the ethylene content, the saponification degree, the MFR, and the content of metals (Mg, K, and Na) of the EVOH (A1).
- EVOHs (A2 to A14) were produced in the same manner as in the EVOH (A1) except that the type of the ethylene-vinyl acetate copolymer used and the amount of the additive used were changed. Further, EVOHs (A15 and A16) were produced in the same manner as in the EVOH (Al) except that the type of the additive used was changed (from magnesium acetate to zinc acetate or calcium acetate).
- Table 1 shows the ethylene content, the saponification degree, the MFR, and the content of metals (Mg, Zn, Ca, K, and Na) of the EVOHs (A2 to A16).
- a maleic anhydride graft-modified high-density polyethylene [with a density of 0.945 g/cm 3 , a MFR (measured at 210° C. under a load of 2160 g) of 1.8 g/10 minute, and an acid value of 2.8 mgKOH/g] and 0.0007 part by weight of a hydrotalcite (“DHT-4A” manufactured by Kyowa Chemical Industry Co., Ltd.) were melt-kneaded by an extruder (at a set temperature of 230° C.), to obtain a maleic anhydride-modified polyolefin (B1).
- Table 2 shows the acid value, the MFR, and the content of metals (Mg, Al, and Ti) of (B1).
- Pellets of maleic anhydride modified high density polyolefins (B2 to B17) were produced in the same manner as in (A1) except that the types and the amounts of the maleic anhydride graft-modified polyethylene and the hydrotalcite used were changed.
- Table 3 shows the acid value, the MFR, and the content of metals (Mg, Zn, Ca, Al, and Ti) of (B2) to (B17).
- High-density polyethylenes (C1) to (C4) shown in Table 5 were used.
- Table 3 shows the density, the MFR, and the content of metal (Mg) of (C1) to (C4).
- Type C1 C2 C3 C4 Mg ( ⁇ mol/g) 0 0.5 0 0 Density (g/cm 3 ) 0.950 0.950 0.950 0.950 MFR (210° C., 2160 g) 0.07 0.07 0.01 0.3
- a container that is the same as below except for not containing the resin composition (D) layer was fabricated, and pellets of the resin composition (D) were fabricated using the container.
- A1 as the EVOH (A), B1 as the adhesive resin (B), and C1 as the high-density polyethylene (C) a three-material, five-layer parison of (inner side) C/B/A/B/C (outer side) were extruded at 210° C. using a blow molding machine “TB-ST-6P” manufactured by Suzuki Tekkosho, followed by blowing within dies at 15° C.
- the obtained container was crushed and thereafter was melt-extruded to obtain pellets of the resin composition (D).
- the content of metal elements in the resin composition (D) obtained was measured by the aforementioned method. Table 4 shows the results.
- the obtained container was crushed and thereafter was melt-extruded to obtain recycled pellets.
- the recycled pellets were subjected to extrusion blow molding to mold a 500-ml single-layer container (with a diameter at the bottom of 100 mm, a height of 64 mm, and a thickness of 5000 ⁇ m).
- the obtained container was filled with water and was dropped from a height of 6 m onto a concrete, which was evaluated according to the following criteria. Table 4 shows the results.
- a film was formed under the following conditions to obtain a single layer film having the same thickness as the EVOH (A) layer in the aforementioned fuel container.
- C2 to C3 220° C.
- die 220° C.
- Cooling roll temperature 40° C.
- the oxygen transmission rate (OTR) was measured using an oxygen transmission rate measuring device (“OX-Tran2/20” manufactured by Modern Controls Inc.) under conditions of 20° C. and 65% RH according to the method of JIS-K7126 (isopiestic method).
- Containers were fabricated and evaluated in the same manner as in Example 1 except that the thickness of each layer and the type of the resin used were changed to the values shown in Tables 4 to 6. Further, recycled pellets, containers for evaluating the impact resistance, EVOH single layer films were fabricated and evaluated in the same manner as in Example 1.
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Abstract
Provided is a fuel container composed of a multilayer structure containing: an ethylene-vinyl alcohol copolymer (A) layer; an adhesive resin (B) layer; a high-density polyethylene (C) layer; and a resin composition (D) layer, wherein the ethylene-vinyl alcohol copolymer (A) contains 15 to 44 mol % of ethylene, the adhesive resin (B) is a maleic anhydride-modified polyolefin having an acid value of 0.1 to 10 mgKOH/g and containing 1 to 8.5 μmol/g of magnesium element, calcium element, zinc element, or a combination thereof, the resin composition (D) contains the ethylene-vinyl alcohol copolymer (A), the adhesive resin (B), and the high-density polyethylene (C), the thickness of the (A) layer, the (B) layer, and the (C) layer satisfies specific conditions, and the ethylene-vinyl alcohol copolymer (A), the adhesive resin (B), and the high-density polyethylene (C) satisfies specific conditions. The fuel container is excellent in fuel barrier properties and impact resistance and enables stable production.
Description
The present invention relates to a fuel container that is excellent in fuel barrier properties and impact resistance, and that enables stable production.
In recent years, as containers for storing fuels such as hydrocarbons, coextrusion blow-molded containers made of plastic have been used, and examples thereof include fuel containers for automobiles. As fuel containers made of plastic, those of polyethylene single layer have been widely adopted but have a disadvantage of having comparatively high fuel transmittance.
As a method to overcome such a disadvantage, a method of forming a multilayer including an ethylene-vinyl alcohol copolymer (which may be hereinafter abbreviated as EVOH) layer and a polyolefin layer is known (Patent Document 1). Further, in fuel containers having an EVOH layer and a polyolefin layer, a fuel container in which the EVOH layer is disposed on the inner side in order to improve the fuel barrier properties is also known (Patent Document 2).
By the way, when producing fuel containers by coextrusion blow molding or the like, loss parts during molding such as burrs generally occur. Use of a recovered material layer formed by remelting such loss parts during molding, rejected items in molding, or the like as a part of the fuel containers reduces the amount of waste and thus is preferable also in view of environmental protection, and a cost reduction effect is also obtained.
However, there have been cases where foreign matter derived from EVOH occurs in the recovered material layer, thereby reducing the impact resistance or the fuel barrier properties of fuel tanks. In particular, when continuing the production of fuel tanks over a long period of time, such foreign matter tends to occur, which has been a problem.
- Patent Document 1: US Patent Publication No. 5849376
- Patent Document 2: JP9-29904 A
The present invention has been devised in order to solve the aforementioned problem, and it is an object of the present invention to provide a fuel container that is excellent in fuel barrier properties and impact resistance, and that enables stable production.
The aforementioned problem is solved by providing a fuel container composed of a multilayer structure containing: an EVOH (A) layer; an adhesive resin (B) layer; a high-density polyethylene (C) layer; and a resin composition (D) layer, wherein the EVOH (A) contains 15 to 44 mol % of ethylene, the adhesive resin (B) is a maleic anhydride-modified polyolefin having an acid value of 0.1 to 10 mgKOH/g and containing 1 to 8.5 μmol/g of magnesium element, calcium element, zinc element, or a combination thereof, the resin composition (D) contains the EVOH (A), the adhesive resin (B), and the high-density polyethylene (C), and the fuel container satisfies formulas (1) to (6) below.
0.05≤Ma/Mb≤40 (1)
2≤Ma/Mc≤1800 (2)
0.05≤Ma/Mb≤40 (1)
2≤Ma/Mc≤1800 (2)
In formulas (1) and (2) above, Ma, Mb, and Mc are respectively as follows: Ma represents a MFR (g/10 min) of the EVOH (A) (measured at 210° C. under a load of 2160 g); Mb represents a MFR (g/10 min) of the adhesive resin (B) (measured at 210° C. under a load of 2160 g); and Mc represents a MFR (g/10 min) of the high-density polyethylene (C) (measured at 210° C. under a load of 2160 g).
0.003≤Ta/Tt≤0.12 (3)
0.0015≤Tb/Tt≤0.12 (4)
0.83≤(Tc+Td)/Tt≤0.99 (5)
0.02≤Td/(Tc+Td)≤0.90 (6)
0.003≤Ta/Tt≤0.12 (3)
0.0015≤Tb/Tt≤0.12 (4)
0.83≤(Tc+Td)/Tt≤0.99 (5)
0.02≤Td/(Tc+Td)≤0.90 (6)
In formulas (3) to (6) above, Ta represents the total thickness of the (A) layer, Tb represents the total thickness of the (B) layer, Tc represents the total thickness of the (C) layer, Td represents the total thickness of the (D) layer, and Tt represents the overall thickness (Ta+Tb+Tc+Td).
At this time, it is suitable that the resin composition (D) contains 1 to 20 mass % of the EVOH (A), 1 to 20 mass % of the adhesive resin (B), and 60 to 98 mass % of the high-density polyethylene (C). It is also suitable that the resin composition (D) contains 0.001 to 1 μmol/g of magnesium element, calcium element, zinc element, or a combination thereof. It is also suitable that the resin composition (D) contains 0.001 to 5 μmol/g of an alkali metal element.
It is also suitable that the fuel container satisfies formula (7) below.
0.3≤(VA×Ta)/(MT×Tb)≤1000 (7)
0.3≤(VA×Ta)/(MT×Tb)≤1000 (7)
In formula (7) above, VA, MT, Ta, and Tb are respectively as follows: VA represents a vinyl alcohol content (mol %) in the EVOH (A); MT represents the total amount (μmol/g) of magnesium element, calcium element, and zinc element in the adhesive resin (B); Ta represents the total thickness (μm) of the EVOH (A) layer; and Tb represents the total thickness (μm) of the adhesive resin (B) layer.
It is also suitable that the EVOH (A) contains 0.04 to 13 μmol/g of an alkali metal element.
It is also suitable that the adhesive resin (B) contains 0.35 to 11.5 μmol/g of aluminum element and 0.5 μmol/g or less of titanium element.
It is also suitable that the total amount of magnesium element, calcium element, and zinc element in the high-density polyethylene (C) is 0.5 μmol/g or less.
It is also suitable that the EVOH (A) layer and the adhesive resin (B) layer are in contact with each other in the fuel container.
The fuel container of the present invention is excellent in fuel barrier properties and impact resistance. Further, even in the case where molding of the fuel container of the present invention is continued over a long period of time, generation of foreign matter derived from the EVOH (A) in the resin composition (D) is suppressed. Accordingly, the fuel container of the present invention is stably produced and thus is excellent in productivity.
The fuel container of the present invention is a fuel container composed of a multilayer structure containing an EVOH (A) layer, an adhesive resin (B) layer, a high-density polyethylene (C) layer, and a resin composition (D) layer, wherein the EVOH (A) contains 15 to 44 mol % of ethylene, the adhesive resin (B) is a maleic anhydride-modified polyolefin having an acid value of 0.1 to 10 mgKOH/g and containing 1 to 8.5 μmol/g of magnesium element, calcium element, zinc element, or a combination thereof, the resin composition (D) contains the EVOH (A), the adhesive resin (B), and the high-density polyethylene (C), and the fuel container satisfies formulas (1) to (6) below.
0.05≤Ma/Mb≤40 (1)
Ma/Mc≤1800 (2)
0.05≤Ma/Mb≤40 (1)
Ma/Mc≤1800 (2)
In formulas (1) and (2) above, Ma, Mb, and Mc are respectively as follows: Ma represents the MFR (g/10 min) of the EVOH (A) (measured at 210° C. under a load of 2160 g); Mb represents the MFR (g/10 min) of the adhesive resin (B) (measured at 210° C. under a load of 2160 g); and Mc represents the MFR (g/10 min) of the high-density polyethylene (C) (measured at 210° C. under a load of 2160 g).
0.003≤Ta/Tt≤0.12 (3)
0.0015≤Tb/Tt≤0.12 (4)
0.83≤(Tc+Td)/Tt≤0.99 (5)
0.02≤Td/(Tc+Td)≤0.90 (6)
0.003≤Ta/Tt≤0.12 (3)
0.0015≤Tb/Tt≤0.12 (4)
0.83≤(Tc+Td)/Tt≤0.99 (5)
0.02≤Td/(Tc+Td)≤0.90 (6)
In formulas (3) to (6) above, Ta represents the total thickness of the (A) layer, Tb represents the total thickness of (B) layer, Tc represents the total thickness of the (C) layer, Td represents the total thickness of the (D) layer, and Tt represents the overall thickness (Ta+Tb+Tc+Td).
The EVOH (A) used in the present invention is obtained by saponification of an ethylene-vinyl ester copolymer. The vinyl ester is typified by vinyl acetate, but other fatty acid vinyl esters (such as vinyl propionate and vinyl pivalate) also can be used. The ethylene content of the EVOH (A) is 15 to 44 mol %. In the case where the ethylene content of the EVOH (A) is less than 15 mol %, the productivity of the fuel container decreases. The ethylene content of the EVOH (A) is preferably 18 mol % or more. Meanwhile, in the case where the ethylene content of the EVOH (A) is over 44 mol %, the fuel barrier properties are insufficient. The ethylene content of the EVOH (A) is preferably 38 mol % or less, more preferably 35 mol % or less. Further, the saponification degree of the vinyl ester component of the EVOH (A) is preferably 90% or more, more preferably 95% or more, further preferably 99% or more. When the saponification degree is less than 90 mol %, the fuel barrier properties may possibly be insufficient. The ethylene content and the saponification degree of the EVOH (A) can be determined by the nuclear magnetic resonance (NMR) technique.
The EVOH (A) may be obtained by copolymerization of monomers other than ethylene, vinyl alcohol, and vinyl ester, as long as the object of the present invention is not inhibited. Examples of the copolymerizable monomers include α-olefins such as propylene, 1-butene, isobutene, 4-methyl-1-pentene, 1-hexene, and 1-octene; unsaturated carboxylic acids such as itaconic acid, methacrylic acid, acrylic acid, and maleic anhydride, salts thereof, partial or complete esters thereof, nitriles thereof, amides thereof, and anhydrides thereof; vinyl silane compounds such as vinyltrimethoxysilane; unsaturated sulfonic acids or salts thereof; alkylthiols; and vinyl pyrrolidones. The content of monomer units other than ethylene units, vinyl alcohol units, and vinyl ester units in the EVOH (A) is generally 10 mol % or less, suitably 5 mol % or less, more suitably 1 mol % or less.
The EVOH (A) suitably contains 0.1 to 4.5 μmol/g of magnesium element, calcium element, zinc element, or a combination thereof. This further suppresses the deterioration of the EVOH (A), thereby further reducing the foreign matter derived from the EVOH (A) in the resin composition (D) in the case where the production of the fuel container is continued over a long period of time. Accordingly, further stable production of the fuel container is enabled. The total amount of magnesium element, calcium element, and zinc element in the EVOH (A) is more suitably 0.5 μmol/g or more, further suitably 1 μmol/g or more. Meanwhile, the total amount is more suitably 3 μmol/g or less, further suitably 2 μmol/g or less. Here, the molar ratio of magnesium element with respect to the total of magnesium element, calcium element, and zinc element in the EVOH (A) is more suitably 0.5 or more, further suitably 0.8 or more.
The forms of magnesium element, calcium element, and zinc element contained in the EVOH (A) are not specifically limited, and examples thereof include metal salts and metal oxides. Among these, metal salts are preferable. Examples of the metal salts include aliphatic carboxylates, aromatic carboxylates, phosphates, carbonates, sulfates, and silicates, and double salts also can be used as the metal salts. Among these, aliphatic carboxylates are preferable as the metal salts. Examples of carboxylic acids constituting the aliphatic carboxylates include aliphatic carboxylic acids having 1 to 28 carbon atoms such as formic acid, acetic acid, propionic acid, butyric acid, lauric acid, stearic acid, myristic acid, behenic acid, and montanic acid. Further, use of the double salts as the metal salts is also preferable, and hydrotalcites are more preferable. As the hydrotalcites, those described below as hydrotalcites contained in the adhesive resin (B) can be mentioned.
It is also suitable that the EVOH (A) contains 0.04 to 13 μmol/g of alkali metal elements. This accelerates the reaction of the EVOH (A) with the adhesive resin (B) to further improve the dispersibility of the EVOH (A) in the resin composition (D) layer. Further, the foreign matter derived from the EVOH (A) when the production of the fuel container is continued over a long period of time is further reduced. Accordingly, further stable production of the fuel container is enabled. In the case where the content of alkali metal elements in the EVOH (A) is less than 0.04 μmol/g, the aforementioned effects cannot be obtained. The content of alkali metal elements is more suitably 0.5 μmol/g or more, further suitably 1 μmol/g or more. Meanwhile, in the case where the content of alkali metal elements is over 13 μmol/g, the EVOH (A) easily deteriorates, and the foreign matter may possibly increase. The content of alkali metal elements is more suitably 10.5 μmol/g or less.
Examples of the alkali metal elements contained in the EVOH (A) include sodium, potassium, and lithium. The forms of these alkali metal elements are not specifically limited, and examples thereof include alkali metal salts such as aliphatic carboxylates, aromatic carboxylates, phosphates, metal complexes. Examples of the alkali metal salts include sodium acetate, potassium acetate, sodium phosphate, potassium phosphate, lithium phosphate, sodium stearate, potassium stearate, and the sodium salt of ethylenediaminetetraacetic acid. Among these, sodium acetate, potassium acetate, and sodium phosphate are suitable.
The EVOH (A) may further contain boron compounds, phosphate compounds, and the like. Addition of boron compounds can improve the melt viscosity of the EVOH (A). Further, addition of phosphate compounds can suppress coloration of molded products. Generally, the content of boron compounds is 20 to 2000 ppm in terms of boron element, and the content of phosphate compounds is 10 to 500 ppm in terms of phosphate radical.
As long as the effects of the present invention are not inhibited, the
EVOH (A) may contain various additives. Examples of such additives include antioxidants, plasticizers, heat stabilizers, ultraviolet absorbers, antistatic agents, lubricants, coloring agents, fillers, and other resins, and specific examples thereof are as follows. The content of these additives in the EVOH (A) is generally 10 mass % or less, suitably 5 mass % or less, more suitably 1 mass % or less.
Antioxidants: 2,5-di-t-butyl hydroquinone, 2,6-di-t-butyl-p-cresol, 4,4′-thiobis-(6-t-butylphenol), 2,2′-methylene-bis-(4-methyl-6-t-butylphenol), octadecyl-3-(3′,5′-di-t-butyl-4′-hydroxyphenyl) propionate, 4,4′-thiobis-(6-t-butylphenol), and the like.
Ultraviolet absorbers: ethylene-2-cyano-3,3′-diphenyl acrylate, 2-(2′-hydroxy-5′-methylphenyl) benzotriazole, 2-(2′-hydroxy-5′-methylphenyl) benzotriazole, 2-(2′-hydroxy-5′-methylphenyl) benzotriazole, 2-(2′-hydroxy-3′-t-butyl-5′-methylphenyl)5-chlorobenzotriazole, 2-hydroxy-4-methoxybenzophenone, 2,2′-dihydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, and the like.
Plasticizers: dimethyl phthalate, diethyl phthalate, dioctyl phthalate, waxes, liquid paraffins, phosphate esters, and the like.
Antistatic agents: pentaerythritol monostearate, sorbitan monopalmitate, sulfated polyolefins, polyethylene oxides, carbowaxes, and the like.
Lubricants: ethylenebisstearamide, butyl stearate, and the like.
Coloring agents: carbon black, phthalocyanine, quinacridone, indoline, azo pigments, colcothar, and the like.
Fillers: glass fibers, asbestos, wollastonite, calcium silicate, talc, montmorillonite, and the like.
Plasticizers: dimethyl phthalate, diethyl phthalate, dioctyl phthalate, waxes, liquid paraffins, phosphate esters, and the like.
Antistatic agents: pentaerythritol monostearate, sorbitan monopalmitate, sulfated polyolefins, polyethylene oxides, carbowaxes, and the like.
Lubricants: ethylenebisstearamide, butyl stearate, and the like.
Coloring agents: carbon black, phthalocyanine, quinacridone, indoline, azo pigments, colcothar, and the like.
Fillers: glass fibers, asbestos, wollastonite, calcium silicate, talc, montmorillonite, and the like.
The MFR (melt flow rate) of the EVOH (A) used in the present invention (measured at 210° C. under a load of 2160 g according to JIS K 7210) is suitably 1 to 18 g/10 min. In the case where the MFR of the EVOH (A) is over 18 g/10 min, the difference in melt viscosity between the EVOH (A) and the adhesive resin (B) and the difference in melt viscosity between the EVOH (A) and the high-density polyethylene (C) may possibly be excessively large. When the difference in melt viscosity is excessively large as above, the dispersibility of the EVOH (A) in the resin composition (D) layer is insufficient, and the foreign matter derived from the EVOH (A) may possibly increase. The MFR of the EVOH (A) is more suitably 10 g/10 min or less. Meanwhile, in the case where the MFR of the EVOH (A) is less than 1 g/10 min, the difference in melt viscosity between the EVOH (A) and the adhesive resin (B) may possibly be excessively large. The MFR of the EVOH (A) is more suitably 1.5 g/10 min or more.
The maleic anhydride-modified polyolefin used as the adhesive resin (B) can be obtained, for example, by graft modification of a polyolefin with maleic anhydride or copolymerization of an olefin with maleic anhydride. Examples of the maleic anhydride-modified polyolefin used as the adhesive resin (B) include maleic anhydride-modified products of polyethylenes [such as high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and ultra-low-density polyethylene (VLDPE)], homo-polypropylene, random polypropylene, block polypropylene, ethylene-vinyl acetate copolymer, and ethylene-(meth)acrylic acid ester copolymer. Among these, maleic anhydride-modified products of high-density polyethylene, linear low-density polyethylene, and low-density polyethylene are suitable, and maleic anhydride-modified products of high-density polyethylene are particularly suitable.
The acid value of the maleic anhydride-modified polyolefin used as the adhesive resin (B) needs to be 0.1 to 10 mgKOH/g. This accelerates the reaction of the EVOH (A) with the adhesive resin (B) to improve the dispersibility of the EVOH (A) in the resin composition (D) layer. The improvement of the dispersibility of the EVOH (A) reduces the foreign matter derived from the EVOH (A) in the resin composition (D) layer when the production of the fuel container is continued over a long period of time and enables stable production of the fuel container. In the case where the acid value is less than 0.1 mgKOH/g, the dispersibility of the EVOH (A) is insufficient, and therefore the foreign matter increases. The acid value is suitably 0.5 mgKOH/g or more. Meanwhile, in the case where the acid value is over 10 mgKOH/g, the EVOH (A) easily deteriorates, and therefore the foreign matter increases. The acid value is suitably 6 mgKOH/g or less.
The maleic anhydride-modified polyolefin used as the adhesive resin (B) needs to contain 1 to 8.5 μmol/g of magnesium element, calcium element, zinc element, or a combination thereof. This suppresses the deterioration of the EVOH (A), thereby reducing the foreign matter derived from the EVOH (A) in the resin composition (D) when the production of the fuel container is continued over a long period of time. Accordingly, stable production of the fuel container is enabled. In the case where the total amount of magnesium element, calcium element, and zinc element in the adhesive resin (B) is less than 1 μmol/g, the EVOH (A) easily deteriorates, and therefore the foreign matter increases. The the total amount is suitably 1.2 μmol/g or more. Meanwhile, in the case where the total amount of magnesium element, calcium element, and zinc element is over 8.5 μmol/g, degradation of the EVOH (A) proceeds to increase the difference in viscosity from the high-density polyethylene (C). Therefore, the degraded EVOH (A) is poorly dispersed in the resin composition (D) to form foreign matter. The total amount is suitably 6.5 μmol/g or less. Here, the molar ratio of magnesium element with respect to the total of magnesium element, calcium element, and zinc element in the adhesive resin (B) is more suitably 0.5 or more, further suitably 0.8 or more.
The forms of magnesium element, calcium element, and zinc element contained in the adhesive resin (B) are not specifically limited, and examples thereof include metal salts and metal oxides. Among these, metal salts are preferable. Examples of the metal salts include aliphatic carboxylates, aromatic carboxylates, phosphates, carbonates, sulfates, and silicates, and double salts also can be used as the metal salts. Among these, double salts and aliphatic carboxylates are preferable as the metal salts, and the former is more preferable. As the double salts, hydrotalcites are preferable, and specific examples thereof include those represented by the following formula.
m xAly(OH)2x+3y-2z(b)z .aH2O
m xAly(OH)2x+3y-2z(b)z .aH2O
In the formula, m represents one or more of Mg, Ca, and Zn, or a combination of one or more of Mg, Ca, and Zn with one or more of Sr, Ba, Cd, Pb, and Sn, b represents CO3 or HPO4, x, y, and z each represent a positive number, a represents 0 or a positive number, and 2x+3y−2z>0.
Among hydrotalcites represented by the aforementioned formula, those with m being one or more of Mg, Ca, and Zn are preferable, and the following hydrotalcites are particularly suitable.
Mg6Al2(OH)16CO3.4H2O
Mg8Al2(OH)20CO3.5H2O
Mg5Al2(OH)14CO3.4H2O
Mg10Al2(OH)22(CO3)2.4H2O
Mg6Al2(OH)16HPO4.4H2O
Ca6Al2(OH)16CO3.4H2O
Zn6Al2(OH)16CO3.4H2O
Mg3ZnAl2(OH)12CO3.2.7H2O
Mg6Zn2Al2(OH)20CO3.1.6H2O
Mg5Zn1.7Al3.3(OH)20(CO3)1.65.4.5H2O
Mg6Al2(OH)16CO3.4H2O
Mg8Al2(OH)20CO3.5H2O
Mg5Al2(OH)14CO3.4H2O
Mg10Al2(OH)22(CO3)2.4H2O
Mg6Al2(OH)16HPO4.4H2O
Ca6Al2(OH)16CO3.4H2O
Zn6Al2(OH)16CO3.4H2O
Mg3ZnAl2(OH)12CO3.2.7H2O
Mg6Zn2Al2(OH)20CO3.1.6H2O
Mg5Zn1.7Al3.3(OH)20(CO3)1.65.4.5H2O
Further, examples of the carboxylic acids constituting the aliphatic carboxylates include aliphatic carboxylic acids having 1 to 28 carbon atoms such as formic acid, acetic acid, propionic acid, butyric acid, lauric acid, stearic acid, myristic acid, behenic acid, and montanic acid.
In the adhesive resin (B), it is suitable that the content of aluminum element is 0.35 to 11.5 μmol/g, and the content of titanium element is 0.5 μmol/g or less. In the case where the content of aluminum element is less than 0.35 μmol/g, or the content of titanium element is over 0.5 μmol/g, the EVOH (A) easily deteriorates, and foreign matter in the resin composition (D) may possibly increase. The content of aluminum element is more suitably 1.5 μmol/g or more. Meanwhile, in the case where the content of aluminum element is over 11.5 μmol/g, compounds containing aluminum element form foreign matter due to aggregation or the like, and the impact resistance may possibly decrease. The content of aluminum element is more suitably 8 μmol/g or less, further suitably 5 μmol/g or less. Aluminum element can be contained in the adhesive resin (B) as hydrotalcites or the like. Further, titanium element may be contained in the adhesive resin (B) due to a catalyst or the like used in the production of the adhesive resin (B) remaining there in some cases.
As long as the effects of the present invention are not inhibited, the adhesive resin (B) may contain various additives. Examples of such additives can include antioxidants, plasticizers, heat stabilizers, ultraviolet absorbers, antistatic agents, lubricants, coloring agents, fillers, and other resins. Specific examples thereof include those described above as the additives used for the EVOH (A). The content of these additives in the adhesive resin (B) is generally 10 mass % or less, suitably 5 mass % or less, more suitably 1 mass % or less.
The MFR (melt flow rate) of the adhesive resin (B) (measured at 210° C. under a load of 2160 g according to JIS K 7210) is suitably 0.5 to 12 g/10 min. In the case where the MFR of the adhesive resin (B) is over 12 g/10 min, the difference in melt viscosity between the adhesive resin (B) and the high-density polyethylene (C) may possibly be excessively large. When the difference in melt viscosity is excessively large as above, the dispersibility of the EVOH (A) in the resin composition (D) layer is insufficient, and the foreign matter derived from the EVOH (A) may possibly increase. The MFR of the adhesive resin (B) is more suitably 10 g/10 min or less. Meanwhile, the MFR of the adhesive resin (B) is more suitably 1 g/10 min or more.
The high-density polyethylene (C) used in the present invention can be obtained, for example, by the low-pressure process or the medium-pressure process using a Ziegler catalyst. The density of the high-density polyethylene (C) is generally 0.92 g/cm3 or more, suitably 0.93 g/cm3 or more. In the case where the density is less than 0.92 g/cm3, the fuel barrier properties and the rigidity of the fuel container are insufficient. The density of the high-density polyethylene (C) is generally 1.00 g/cm3 or less.
The total amount of magnesium element, calcium element, and zinc element in the high-density polyethylene (C) is suitably 0.5 μmol/g or less. In the case where the total amount is over 0.5 μmol/g, the foreign matter derived from the EVOH (A) in the resin composition (D) may possibly increase. The total amount is more suitably 0.3 μmol/g or less.
As long as the effects of the present invention are not inhibited, the high-density polyethylene (C) may contain various additives. Examples of such additives can include antioxidants, plasticizers, heat stabilizers, ultraviolet absorbers, antistatic agents, lubricants, coloring agents, fillers, and other resins, and specific examples thereof include those described above as the additives used for the EVOH (A). The content of these additives in the high-density polyethylene (C) is generally 10 mass % or less, suitably 5 mass % or less, more suitably 1 mass % or less.
The MFR (melt flow rate) of the high-density polyethylene (C) (measured at 210° C. under a load of 2160 g according to JIS K 7210) is suitably 0.01 to 0.3 g/10 min. In the case where the MFR of the high-density polyethylene (C) is less than 0.01 g/10 min, the difference in melt viscosity between the EVOH (A) and the high-density polyethylene (C) and the difference in melt viscosity between the adhesive resin (B) and the high-density polyethylene (C) may possibly be excessively large. When the difference in melt viscosity is excessively large as above, the dispersibility of the EVOH (A) in the resin composition (D) layer is insufficient, and the foreign matter derived from the EVOH (A) may possibly increase. The MFR of the high-density polyethylene (C) is more suitably 0.03 g/10 min or more. Meanwhile, in the case where the MFR of the high-density polyethylene (C) is over 0.3 g/10 min, the formability may decrease in some cases. The MFR of the EVOH (A) is more suitably 0.2 g/10 min or less.
The EVOH (A), the adhesive resin (B), and the high-density polyethylene (C) used for the fuel container of the present invention need to satisfy formulas (1) to (2) below.
0.05≤Ma/Mb≤40 (1)
Ma/Mc≤1800 (2)
0.05≤Ma/Mb≤40 (1)
Ma/Mc≤1800 (2)
In formulas (1) and (2) above, Ma, Mb, and Mc are respectively as follows: Ma represents the MFR (g/10 min) of the EVOH (A) (measured at 210° C. under a load of 2160 g); Mb represents the MFR (g/10 min) of the adhesive resin (B) (measured at 210° C. under a load of 2160 g); and Mc represents the MFR (g/10 min) of the high-density polyethylene (C) (measured at 210° C. under a load of 2160 g).
In the case where the Ma/Mb in formula (1) above is less than 0.05 or over 40, the dispersibility of the EVOH (A) in the resin composition (D) layer is insufficient, and the foreign matter derived from the EVOH (A) increases. The
Ma/Mb is suitably 0.5 or more. Meanwhile, the Ma/Mb is suitably 20 or less, more suitably 8 or less.
In formula (2) above, Ma/Mc is 2 or more. The high-density polyethylene has a high melt viscosity, and there is a large difference in melt viscosity between the high-density polyethylene and the EVOH. Therefore, in the case where the high-density polyethylene and the EVOH are melt-kneaded, the EVOH tends to be poorly dispersed. When the dispersion of the EVOH is poor, foreign matter derived from the EVOH occurs. Meanwhile, the EVOH (A) is sufficiently dispersed in the resin composition (D) in the present invention, even in the case where the difference in melt viscosity between the high-density polyethylene (C) having a high melt viscosity and the EVOH (A) is large as above. Accordingly, the foreign matter derived from the EVOH (A) is reduced. Ma/Mc is suitably 10 or more. Meanwhile, in the case where Ma/Mc is over 1800, the difference in melt viscosity between the EVOH (A) and the high-density polyethylene (C) is excessively large, and the dispersibility of the EVOH (A) in the resin composition (D) layer is insufficient, so that foreign matter increases. Ma/Mc is suitably 1500 or less.
The adhesive resin (B) and the high-density polyethylene (C) used for the fuel container of the present invention suitably satisfy formula (8) below.
2≤Mb/Mc≤1000 (8)
2≤Mb/Mc≤1000 (8)
In formula (8) above, Mb and Mc are the same as in formulas (1) and (2) above.
In the case where Mb/Mc in formula (8) above is over 1000, the difference in melt viscosity between the adhesive resin (B) and the high-density polyethylene (C) may possibly be excessively large. When the difference in melt viscosity is excessively large, the dispersibility of the EVOH (A) in the resin composition (D) layer is insufficient, and the foreign matter derived from the EVOH (A) may possibly increase. Meanwhile, the Mb/Mc is more suitably 10 or more.
The resin composition (D) used in the present invention contains the EVOH (A), the adhesive resin (B), and the high-density polyethylene (C).
The content of the EVOH (A) in the resin composition (D) is suitably 1 to 20 mass %. In the case where the content of the EVOH (A) is less than 1 mass %, the usage ratio of recovered materials may possibly decrease. Meanwhile, in the case where the content of the EVOH (A) is over 20 mass %, the impact resistance may possibly decrease.
The content of the adhesive resin (B) in the resin composition (D) is suitably 1 to 20 mass %. In the case where the content of the adhesive resin (B) is less than 1 mass %, the dispersibility of the EVOH (A) decreases, and the foreign matter derived from the EVOH (A) in the resin composition (D) may possibly increase. Meanwhile, in the case where the content of the adhesive resin (B) is over 20 mass %, the reaction of the EVOH (A) with the adhesive resin (B) excessively proceeds, and the foreign matter may possibly increase. The content of the adhesive resin (B) is more suitably 15 mass % or less.
The content of the high-density polyethylene (C) in the resin composition (D) is suitably 60 to 98 mass %. In the case where the content of the high-density polyethylene (C) is less than 60 mass %, the impact resistance may possibly decrease. Meanwhile, in the case where the content of the high-density polyethylene (C) is over 98 mass %, the usage ratio of recovered materials may possibly decrease. The high-density polyethylene (C) is more suitably 95 mass % or less.
Due to the contents of the EVOH (A), the adhesive resin (B), and the high-density polyethylene (C) in the resin composition (D) falling within the aforementioned ranges, the foreign matter derived from the EVOH (A) further decreases, and further stable production of the fuel container is enabled.
It is suitable that the resin composition (D) contains 0.001 to 1 μmol/g of magnesium element, calcium element, zinc element, or a combination thereof. This further suppresses the deterioration of the EVOH (A), and therefore the foreign matter derived from the EVOH (A) in the resin composition (D) is further reduced when the production of the fuel container is continued over a long period of time. Accordingly, further stable production of the fuel container is enabled. The total amount of magnesium element, calcium element, and zinc element is more suitably 0.1 μmol/g or more. Meanwhile, the total amount of magnesium element, calcium element, and zinc element is more suitably 0.6 μmol/g or less, further suitably 0.4 μmol/g or less.
It is also suitable that the resin composition (D) contains 0.001 to 5 μmol/g of alkali metal elements. This accelerates the reaction of the EVOH (A) with the adhesive resin (B), and the dispersibility of the EVOH (A) in the resin composition (D) layer is further improved. This further reduces the foreign matter derived from the EVOH (A) when the production of the fuel container is continued over a long period of time, and further stable production of the fuel container is enabled. In the case where the content of alkali metal elements in the resin composition (D) is less than 0.001 μmol/g, the aforementioned effects cannot be obtained. The content of alkali metal elements is more suitably 0.2 μmol/g or more. Meanwhile, in the case where the content of alkali metal elements is over 5 μmol/g, the EVOH (A) easily deteriorates, and the foreign matter may possibly increase. The content of alkali metal elements is more suitably 2 μmol/g or less.
As long as the effects of the present invention are not inhibited, the resin composition (D) may contain various additives. Examples of such additives can include antioxidants, plasticizers, heat stabilizers, ultraviolet absorbers, antistatic agents, lubricants, coloring agents, fillers, and resins other than the EVOH (A), the adhesive resin (B), and the high-density polyethylene (C), and specific examples thereof include those described above as the additives used for the EVOH (A). The content of these additives in the resin composition (D) is generally 10 mass % or less, suitably 5 mass % or less, more suitably 1 mass % or less.
As the raw materials of the resin composition (D), only unused resins may be used, but recovered materials such as scraps, e.g., burrs generated during production of the fuel container of the present invention and rejected items during molding are preferably used as at least a part of the raw materials.
This reduces the amount of waste and therefore is therefore preferable in view of the environmental protection, and the cost reduction effect also can be obtained. The amount of the recovered materials in the resin composition (D) is suitably 50 mass % or more.
The fuel container of the present invention is composed of a multilayer structure containing the EVOH (A) layer, the adhesive resin (B) layer, the high-density polyethylene (C) layer, and the resin composition (D) layer. Examples of the multilayer structure include the following layer structures. In these examples, the left side represents the inner side of the fuel container, and the right side represents the outer side thereof.
Five layers: (inner side) C/B/NB/D (outer side) and D/B/NB/C
Six layers: (inner side) C/B/A/B/D/C (outer side), C/D/B/A/B/C, D/C/B/NB/C, C/D/B/A/B/D, D/C/B/NB/D, C/B/A/B/C/D, D/B/A/B/D/C, and D/B/NB/C/D
Seven layers: (inner side) C/D/B/A/B/D/C (outer side), C/D/B/A/B/C/D, D/C/B/A/B/C/D, and D/C/B/A/B/D/C
However, the layer structure is not limited to the aforementioned examples. Among these, (inner side) C/B/NB/D/C (outer side) and (inner side) C/D/B/A/B/D/C (outer side) are suitable, and the former is more suitable. Further, the EVOH (A) layer and the adhesive resin (B) layer are suitably in contact with each other in the multilayer structure. This improves the adhesiveness between layers constituting the multilayer structure, therefore improving the mechanical strength of the fuel container.
The thickness of the EVOH (A) layer (thickness per layer) is suitably 20 to 300 μm. In the case where the thickness of the EVOH (A) layer is less than 20 μm, the fuel barrier properties may possibly be insufficient. Meanwhile, in the case where the thickness of the EVOH (A) layer is over 300 μm, the impact resistance may possibly decrease, or the cost may possibly be high.
The thickness of the adhesive resin (B) layer (thickness per layer) is suitably 4 to 300 μm. In the case where the thickness of the adhesive resin (B) layer is less than 4 μm, the dispersibility of the EVOH (A) is insufficient, and foreign matter may possibly increase, when recovered materials are used as raw materials of the resin composition (D). The thickness of the adhesive resin (B) layer is more suitably 7 μm or more. Meanwhile, in the case where the thickness of the adhesive resin (B) layer is over 300 μm, the reaction of the EVOH (A) with the adhesive resin (B) excessively proceeds, and foreign matter may possibly increase, when recovered materials are used as raw materials of the resin composition (D). The thickness of the adhesive resin (B) layer is more suitably 250 μm or less.
The thickness of the high-density polyethylene (C) layer (thickness per layer) is suitably 300 to 3000 μm. In the case where the thickness of the high-density polyethylene (C) layer is less than 300 μm, the impact resistance may possibly decrease. The thickness of the high-density polyethylene (C) layer is more suitably 350 μm or more. Meanwhile, in the case where the thickness of the high-density polyethylene (C) layer is over 3000 μm, the fuel container may possibly be excessively heavy, and the cost may possibly be high. The thickness of the adhesive resin (B) layer is more suitably 2500 μm or less.
The thickness of the resin composition (D) layer (thickness per layer) is suitably 100 to 20000 μm. In the case where the thickness of the resin composition (D) layer is less than 100 μm, the cost may possibly be high. The thickness of the resin composition (D) layer is suitably 200 μm or more. Meanwhile, in the case where the thickness of the resin composition (D) layer is over 20000 μm, the impact resistance may possibly decrease. The thickness of the resin composition (D) layer is suitably 10000 μm or less.
The overall thickness of the multilayer structure constituting the fuel container of the present invention can be appropriately set corresponding to the volume and the application. The overall thickness is generally 500 to 50000 μm. In the case where the overall thickness is less than 500 μm, the mechanical strength of the fuel container may possibly be insufficient. The overall thickness is suitably 1000 μm or more. Meanwhile, in the case where the overall thickness is over 50000 μm, the fuel container may possibly be excessively heavy, and the cost may possibly be high. The overall thickness is suitably 8500 μm or less, more suitably 7000 μm or less.
In the present invention, the thickness of each layer and the overall thickness of the multilayer structure can be determined by measuring the cross section of the body of the fuel container. Specifically, they are average values obtained by cutting the container in a direction rectangular to the flow direction, measuring the cross section of the entire circumference of the cut surface at 30 random points, and thereafter subtracting the average values ±1σ from the obtained values.
The fuel container of the present invention needs to satisfy formulas (3) to (6) below.
0.003≤Ta/Tt≤0.12 (3)
0.0015≤Tb/Tt≤0.12 (4)
0.83≤(Tc+Td)/Tt≤0.99 (5)
0.02≤Td/(Tc+Td)≤0.90 (6)
0.003≤Ta/Tt≤0.12 (3)
0.0015≤Tb/Tt≤0.12 (4)
0.83≤(Tc+Td)/Tt≤0.99 (5)
0.02≤Td/(Tc+Td)≤0.90 (6)
In formulas (3) to (6) above, Ta represents the total thickness of the (A) layer, Tb represents the total thickness of (B) layer, Tc represents the total thickness of the (C) layer, Td represents the total thickness of the (D) layer, and Tt represents the overall thickness (Ta+Tb+Tc+Td).
In the case where Ta/Tt in formula (3) above is less than 0.003, the fuel barrier properties may possibly decrease. Ta/Tt is suitably 0.008 or more. Meanwhile, in the case where Ta/Tt is over 0.12, the impact resistance decreases. Ta/Tt is suitably 0.10 or less.
In the case where Tb/Tt in formula (4) above is less than 0.0015, the dispersibility of the EVOH (A) is insufficient, and the foreign matter derived from the EVOH (A) increases, when recovered materials are used as raw materials of the resin composition (D). Tb/Tt is suitably 0.004 or more. Meanwhile, in the case where Tb/Tt is over 0.12, the reaction of the EVOH (A) with the adhesive resin (B) excessively proceeds, and foreign matter may possibly increase in some cases, when recovered materials are used as raw materials of the resin composition (D).
In formula (5) above, (Tc+Td)/Tt indicates the ratio of the total thickness of the high-density polyethylene (C) layer and the resin composition (D) layer with respect to the overall thickness of the fuel container. In the case where (Tc+Td)/Tt is less than 0.83, the impact resistance decreases. Meanwhile, in the case where (Tc+Td)/Tt is over 0.99, the fuel barrier properties may possibly decrease.
In formula (6) above, Td/(Tc+Td) indicates the ratio of the total thickness of the resin composition (D) layer with respect to the total thickness of the high-density polyethylene (C) layer and the resin composition (D) layer. In the case where Td/(Tc+Td) is less than 0.02, the cost is high. Td/(Tc+Td) is suitably 0.2 or more. Meanwhile, in the case where Td/(Tc+Td) is over 0.90, the impact resistance decreases. Td/(Tc+Td) is suitably 0.83 or less.
It is suitable that the fuel container of the present invention satisfies formula (9) below.
0.02≤Ta/Tb≤40 (9)
0.02≤Ta/Tb≤40 (9)
In formula (9) above, Ta and Tb are the same as in formulas (3) and (4) above.
In formula (9) above, in the case where Ta/Tb is less than 0.02, the reaction of the EVOH (A) with the adhesive resin (B) excessively proceeds, and foreign matter may possibly increase, when recovered materials are used as raw materials of the resin composition (D). Meanwhile, in the case where Ta/Tb is over 40, the dispersibility of the EVOH (A) decreases, and foreign matter may possibly increase, when recovered materials are used as raw materials of the resin composition (D).
It is suitable that the fuel container of the present invention satisfies formula (7) below.
0.3≤(VA×Ta)/(MT×Tb)≤1000 (7)
0.3≤(VA×Ta)/(MT×Tb)≤1000 (7)
In formula (7) above, VA, MT, Ta, and Tb are respectively as follows: VA represents a vinyl alcohol content (mol %) in the ethylene-vinyl alcohol copolymer (A); MT represents the total amount (μmol/g) of magnesium element, calcium element, and zinc element in the adhesive resin (B); Ta represents the total thickness (μm) of the EVOH (A) layer; and Tb represents the total thickness (μm) of the adhesive resin (B) layer.
In the case where (VA×Ta)/(MT×Tb) in formula (7) above is less than 0.3, the total number of moles of magnesium element, calcium element, and zinc element with respect to the number of moles of vinyl alcohol units in the resin composition (D) may possibly be excessively large, when recovered materials are used as raw materials of the resin composition (D). Therefore, the reaction of the EVOH (A) with the adhesive resin (B) excessively proceeds, and foreign matter may possibly increase. (VA×Ta)/(MT×Tb) is suitably 0.5 or more. Meanwhile, in the case where (VA×Ta)/(MT×Tb) is over 1000, the total number of moles of magnesium element, calcium element, and zinc element with respect to the number of moles of vinyl alcohol units in the resin composition (D) may possibly be excessively small, when recovered materials are used as raw materials of the resin composition (D). Therefore, the dispersibility of the EVOH (A) decreases, and foreign matter may possibly increase. (VA×Ta)/(MT×Tb) is suitably 400 or less.
The method for producing the fuel container of the present invention is not specifically limited. Examples thereof can include forming methods that are generally used in the field of polyolefins, such as extrusion molding, blow molding, injection molding, and thermoforming. Among these, blow molding and thermoforming are suitable, coextrusion blow molding and coextrusion sheet thermoforming are particularly suitable, and the former is optimal.
In the case of producing the fuel container by blow molding, any method of coextrusion blow molding and coinjection blow molding can be employed, but coextrusion blow molding, which enables easy formation of complex shapes of containers, is suitable. In coextrusion blow molding, a parison is formed by melt extrusion, the parison is sandwiched by a pair of blow molding dies, so that the parison is cut off while the cut-off portions facing each other are fused. The parison that has been cut off is then formed into a container by being expanded in the mold. However, in the case of large-size containers such as fuel tanks for automobiles, the parison is sandwiched between the dies, and pressure bonding is performed, but it is not cut off in the dies, and the portion protruding from the surface of the container is usually cut off with a cutter or the like at any height.
Further, the die temperature for blow molding the fuel container of the present invention is suitably 5 to 30° C., more preferably 10 to 30° C., further preferably 10 to 20° C. In the case where the die temperature is less than 5° C., condensation tends to occur on the die surfaces, and the appearance of molded products may possibly be poor. Meanwhile, in the case where the die temperature is over 30° C., the productivity may possibly decrease due to an increase in the time to cool the resin, and in the case where the resin cannot be sufficiently cooled, distortion may possibly occur in molded products.
The obtained molded products and container precursors such as a parison and sheets in the course of molding may be subjected to crosslinking by irradiation with radiation or the like.
The fuel container in the present invention means fuel containers mounted on automobiles, motorcycles, ships, aircrafts, power generators, and industrial and agricultural equipment, or portable containers for supplying fuel to these fuel containers, and further containers for storing fuel used for operating these appliances. Further, typical examples of the fuel include regular gasoline, methanol, ethanol, gasoline blending toluene, MTBE, or the like and biodiesel fuel, and the examples also include heavy oil, light oil, and kerosene other than above.
Hereinafter, the present invention will be further specifically described by way of Examples.
[Ethylene Content and Saponification Degree of EVOH]
After the EVOH was dissolved in DMSO-d6, the solution obtained was subjected to 1H-NMR measurement using a nuclear magnetic resonance apparatus “JNM-GX-500”, manufactured by JEOL Ltd., to determine the ethylene content and the saponification degree of the EVOH.
[Content of Metal Elements]
After 5 mL of concentrated nitric acid was added to 0.5 g of the collected resin, the mixture was degraded using a wet decomposition apparatus “MWS-2”, manufactured by ACTAC Project Services Corporation, to obtain a resin degradation solution. The resin degradation solution was measured using an ICP emission spectrometer (“OPTIMA4300DV” manufactured by PerkinElmer, Inc.), thereby determining the amount of metals in the resin.
[MFR]
The MFR of the resin was measured at 210° C. under a load of 2160 g based on JIS K 7210.
[Acid Value of Adhesive Resin]
The acid value of the adhesive resin was determined based on the neutralization titration method of JIS K 0070. Xylene was used as a solvent.
[EVOH]
Production of EVOH (A1)
100 parts by mass of aqueous pellets (moisture content: 50%) composed of an EVOH with an ethylene content of 32 mol % and a saponification degree of 99.99% was immersed in 400 parts by mass of an aqueous solution containing 0.02 g/L of magnesium acetate, 0.025 g/L of sodium acetate, and 0.1 g/L of potassium acetate at 25° C. for 6 hours. After dewatering, drying was performed, to obtain pellets of the EVOH (A1). Table 1 shows the ethylene content, the saponification degree, the MFR, and the content of metals (Mg, K, and Na) of the EVOH (A1).
Production of EVOHs (A2 to A16)
EVOHs (A2 to A14) were produced in the same manner as in the EVOH (A1) except that the type of the ethylene-vinyl acetate copolymer used and the amount of the additive used were changed. Further, EVOHs (A15 and A16) were produced in the same manner as in the EVOH (Al) except that the type of the additive used was changed (from magnesium acetate to zinc acetate or calcium acetate). Table 1 shows the ethylene content, the saponification degree, the MFR, and the content of metals (Mg, Zn, Ca, K, and Na) of the EVOHs (A2 to A16).
| TABLE 1 | ||||||||||||||||
| Type | A1 | A2 | A3 | A4 | A5 | A6 | A7 | A8 | A9 | A10 | A11 | A12 | A13 | A14 | A15 | A16 |
| Content of ethylene | 32 | 27 | 27 | 24 | 15 | 38 | 44 | 32 | 32 | 32 | 32 | 48 | 32 | 32 | 32 | 32 |
| (mol %) | ||||||||||||||||
| Degree of saponification | 99.9 | 99.7 | 99.6 | 99.8 | 99.6 | 99.8 | 99.9 | 99.7 | 99.7 | 99.9 | 99.9 | 99.7 | 99.9 | 99.7 | 99.9 | 99.9 |
| (mol %) | ||||||||||||||||
| Mg (μmol/g) | 1.6 | 0 | 1.6 | 0 | 0 | 0 | 0 | 1.6 | 1.6 | 1.6 | 1.6 | 0 | 1.6 | 1.6 | 0.6 1) | 1.0 2) |
| K (μmol/g) | 1.3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 |
| Na (μmol/g) | 8.7 | 7.0 | 7.0 | 8.7 | 8.7 | 8.7 | 8.7 | 8.7 | 8.7 | 8.7 | 8.7 | 8.7 | 8.7 | 8.7 | 8.7 | 8.7 |
| K+ Na | 10.0 | 7.0 | 7.0 | 8.7 | 8.7 | 8.7 | 8.7 | 8.7 | 8.7 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 |
| (μmol/g) | ||||||||||||||||
| MFR | 3.8 | 4.0 | 3.4 | 2.2 | 3.6 | 3.8 | 3.6 | 1 | 17 | 1 | 17 | 3.6 | 22 | 0.5 | 3.8 | 3.8 |
| (210° C., 2160 g) | ||||||||||||||||
| 1) Zn content derived from zinc acetate | ||||||||||||||||
| 2) Ca content derived from calcium acetate | ||||||||||||||||
[Adhesive Resin]
Production of Maleic Anhydride-Modified Polyolefin (B1)
100 parts by mass of a maleic anhydride graft-modified high-density polyethylene [with a density of 0.945 g/cm3, a MFR (measured at 210° C. under a load of 2160 g) of 1.8 g/10 minute, and an acid value of 2.8 mgKOH/g] and 0.0007 part by weight of a hydrotalcite (“DHT-4A” manufactured by Kyowa Chemical Industry Co., Ltd.) were melt-kneaded by an extruder (at a set temperature of 230° C.), to obtain a maleic anhydride-modified polyolefin (B1). Table 2 shows the acid value, the MFR, and the content of metals (Mg, Al, and Ti) of (B1).
Production of Maleic Anhydride-Modified Polyolefins (B2 to B17)
Pellets of maleic anhydride modified high density polyolefins (B2 to B17) were produced in the same manner as in (A1) except that the types and the amounts of the maleic anhydride graft-modified polyethylene and the hydrotalcite used were changed. Table 3 shows the acid value, the MFR, and the content of metals (Mg, Zn, Ca, Al, and Ti) of (B2) to (B17).
| TABLE 2 | |||||||||||||||||
| Type | B1 | B2 | B3 | B4 | B5 | B6 | B7 | B8 | B9 | B10 | B11 | B12 | B13 | B14 | B15 | B16 | B17 |
| Acid value | 2.8 | 0.1 | 10 | 2.8 | 2.8 | 2.8 | 2.8 | 2.8 | 2.8 | 2.8 | 2.8 | 0.05 | 12 | 2.8 | 2.8 | 2.8 | 2.8 |
| (mgKOH/ | |||||||||||||||||
| g) | |||||||||||||||||
| Mg | 3.3 | 3.3 | 3.3 | 1.0 | 8.2 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 | 0.4 | 10.3 | 1.2 1) | 2.0 2) |
| (μmol/g) | |||||||||||||||||
| Al | 3.7 | 3.7 | 3.7 | 1.2 | 9.3 | 3.7 | 3.7 | 3.7 | 3.7 | 3.7 | 3.7 | 3.7 | 3.7 | 0.5 | 11.6 | 3.7 | 3.7 |
| (μmol/g) | |||||||||||||||||
| Ti | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 | 0.00 | 0.42 | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 |
| (μmol/g) | |||||||||||||||||
| Density | 0.945 | 0.945 | 0.945 | 0.945 | 0.945 | 0.945 | 0.945 | 0.945 | 0.945 | 0.945 | 0.945 | 0.945 | 0.945 | 0.945 | 0.945 | 0.945 | 0.945 |
| (g/cm3) | |||||||||||||||||
| MFR | 1.8 | 1.8 | 1.8 | 1.8 | 1.8 | 1.8 | 1.8 | 0.5 | 10 | 0.3 | 15.0 | 1.8 | 1.8 | 1.8 | 1.8 | 1.8 | 1.8 |
| (210° C, | |||||||||||||||||
| 2160 g) | |||||||||||||||||
| 1) Zn content (“STABIACE HT-7” manufactured by SAKAI CHEMICAL INDUSTRY CO., LTD. was used as a hydrotalcite) | |||||||||||||||||
| 2) Ca content (“C-13” manufactured by Katsuta Kako Co., Ltd. was used as carbonated hydrocalumite) | |||||||||||||||||
[High-Density Polyethylenes]
High-density polyethylenes (C1) to (C4) shown in Table 5 were used. Table 3 shows the density, the MFR, and the content of metal (Mg) of (C1) to (C4).
| TABLE 3 | ||||||
| Type | C1 | C2 | C3 | C4 | ||
| Mg (μmol/g) | 0 | 0.5 | 0 | 0 | ||
| Density (g/cm3) | 0.950 | 0.950 | 0.950 | 0.950 | ||
| MFR (210° C., 2160 g) | 0.07 | 0.07 | 0.01 | 0.3 | ||
[Fabrication of Pellets of Resin Composition (D)]
A container that is the same as below except for not containing the resin composition (D) layer was fabricated, and pellets of the resin composition (D) were fabricated using the container. Hereinafter, a specific description will be given. Using A1 as the EVOH (A), B1 as the adhesive resin (B), and C1 as the high-density polyethylene (C), a three-material, five-layer parison of (inner side) C/B/A/B/C (outer side) were extruded at 210° C. using a blow molding machine “TB-ST-6P” manufactured by Suzuki Tekkosho, followed by blowing within dies at 15° C. and cooling for 20 seconds, to mold a 500-ml container (with a diameter at the bottom of 100 mm and a height of 64 mm) having a total layer thickness of 3300 μm [(inner side) C/B/NB/C (outer side)=1500/100/100/100/1500 μm].
The obtained container was crushed and thereafter was melt-extruded to obtain pellets of the resin composition (D). The content of metal elements in the resin composition (D) obtained was measured by the aforementioned method. Table 4 shows the results.
[Fabrication of Container]
Using A1 as the EVOH (A), B1 as the adhesive resin (B), C1 as the high-density polyethylene (C), and the aforementioned pellets as the resin composition (D), a four-material, six-layer parison of (inner side) C/B/NB/D/C (outer side) were extruded at 210° C. using a blow molding machine “TB-ST-6P” manufactured by Suzuki Tekkosho, followed by blowing within dies at 15° C. and cooling for 20 seconds, to mold a 500-ml container (with a diameter at the bottom of 100 mm and a height of 64 mm) having a total layer thickness of 5100 μm [(inner side) C/B/NB/D/C (outer side)=1500/100/100/100/1800/1500 μm]. The thickness of each layer was determined by the aforementioned method. Table 4 also shows the type of the resin and the thickness of each layer used. The fuel barrier properties of the container obtained were evaluated. [Evaluation of fuel barrier properties]
300 ml of [a mixture at a ratio of toluene (50 mass %):isooctane (50 mass %)] was put into the container obtained above and was completely sealed so as not to leak, which was allowed to stand in an atmosphere of 20° C. and 65% RH, to determine the decrease in bottle mass (the average of n=6) after a lapse of 4 days. Table 4 shows the results.
[Evaluation of Impact Resistance (Multilayer Container)]
The obtained multilayer container was filled with water and was dropped from a height of 6 m onto a concrete so that the corner at the bottom collides therewith with n=10, which was evaluated according to the following criteria. Table 4 shows the results.
A: No damage
B: Partially whitened
C: Cracks occurred
D: Broken
[Evaluation of Impact Resistance (Single Layer of Resin Composition (D))]
The obtained container was crushed and thereafter was melt-extruded to obtain recycled pellets. The recycled pellets were subjected to extrusion blow molding to mold a 500-ml single-layer container (with a diameter at the bottom of 100 mm, a height of 64 mm, and a thickness of 5000 μm). The obtained container was filled with water and was dropped from a height of 6 m onto a concrete, which was evaluated according to the following criteria. Table 4 shows the results.
A: No damage
B: Partially whitened
C: Cracks occurred
D: Broken
[Evaluation of Amount of Foreign Matter]
75 g of the recycled pellets was put into a roller mixer (“R100” manufactured by Toyo Seiki Seisaku-sho, Ltd.), followed by stirring at 240° C. and 100 rpm for 2 hours. After stopping the stirring, the resin composition was taken out, and a high-density polyethylene (“MIRASON 16P” manufactured by Japan Polyethylene Corporation) was put into a roller mixer (“R100” manufactured by Toyo Seiki Seisaku-sho, Ltd.), followed by stirring at 240° C. and 100 rpm for 10 minutes. After stopping the stirring, the resin composition was taken out, and the resin (foreign matter) adhering to the inside of the mixer was collected and weighed. Table 4 shows the results.
[Oxygen Transmission Rate (OTR) of EVOH Single-Layer Film]
Using A1 as the EVOH (A), a film was formed under the following conditions to obtain a single layer film having the same thickness as the EVOH (A) layer in the aforementioned fuel container.
Apparatus: 20-mm diameter single screw extruder (“Labo Prastom ill 4M150” manufactured by Toyo Seiki Seisaku-sho, Ltd.)
L/D: 20
Screw: Full flight
Dies: 300-mm coat hanger dies
Extrusion temperature: C1=180° C., C2 to C3=220° C., and die=220° C.
Screen: 50/100/50
Cooling roll temperature: 40° C.
After the obtained single layer film was humidified under conditions of 20° C. and 65% RH, the oxygen transmission rate (OTR) was measured using an oxygen transmission rate measuring device (“OX-Tran2/20” manufactured by Modern Controls Inc.) under conditions of 20° C. and 65% RH according to the method of JIS-K7126 (isopiestic method).
Containers were fabricated and evaluated in the same manner as in Example 1 except that the thickness of each layer and the type of the resin used were changed to the values shown in Tables 4 to 6. Further, recycled pellets, containers for evaluating the impact resistance, EVOH single layer films were fabricated and evaluated in the same manner as in Example 1.
| TABLE 4 | |||||||||
| Exam- | Exam- | Exam- | Exam- | Exam- | Exam- | Exam- | Exam- | ||
| ple 1 | ple 2 | ple 3 | ple 4 | ple 5 | ple 6 | ple 7 | ple 8 | ||
| A | Type | A1 | A2 | A3 | A4 | A5 | A6 | A7 | A8 |
| Thickness | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
| (μm) | |||||||||
| B | Type | B1 | B1 | B1 | B1 | B1 | B1 | B1 | B1 |
| Thickness | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
| (μm) | |||||||||
| C | Type | C1 | C1 | C1 | C1 | C1 | C1 | C1 | C1 |
| Thickness | 1500 | 1500 | 1500 | 1500 | 1500 | 1500 | 1500 | 1500 | |
| (μm) | |||||||||
| D | A (mass %) | 3.8 | 3.8 | 3.8 | 3.9 | 4.0 | 3.7 | 3.6 | 3.8 |
| B (mass %) | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | |
| C (mass %) | 90.2 | 90.2 | 90.2 | 90.1 | 90.0 | 90.3 | 90.4 | 90.2 | |
| Mg (μmol/g) | 0.26 | 0.20 | 0.26 | 0.20 | 0.20 | 0.20 | 0.20 | 0.26 | |
| K + Na | 0.38 | 0.26 | 0.26 | 0.34 | 0.35 | 0.32 | 0.31 | 0.33 | |
| (μmol/g) | |||||||||
| Al (ppm) | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | |
| Ti (ppm) | 0.14 | 0.14 | 0.14 | 0.14 | 0.14 | 0.14 | 0.14 | 0.14 | |
| Ta/Tb | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
| Thickness | 1800 | 1800 | 1800 | 1800 | 1800 | 1800 | 1800 | 1800 | |
| (μm) | |||||||||
| Ta/Tt | 0.020 | 0.020 | 0.020 | 0.020 | 0.020 | 0.020 | 0.020 | 0.020 |
| Tb/Tt | 0.039 | 0.039 | 0.039 | 0.039 | 0.039 | 0.039 | 0.039 | 0.039 |
| (Tc + Td)/Tt | 0.94 | 0.94 | 0.94 | 0.94 | 0.94 | 0.94 | 0.94 | 0.94 |
| Td/(Tc + Td) | 0.38 | 0.38 | 0.38 | 0.38 | 0.38 | 0.38 | 0.38 | 0.38 |
| Ma/Mb | 2.1 | 2.2 | 1.9 | 1.2 | 2.0 | 2.1 | 2.0 | 0.56 |
| Ma/Mc | 54 | 57 | 49 | 31 | 51 | 54 | 51 | 14 |
| Ta/Tb | 0.50 | 0.50 | 0.50 | 0.50 | 0.50 | 0.50 | 0.50 | 0.50 |
| (VA × Ta)/ | 4.9 | 4.1 | 4.1 | 3.6 | 2.3 | 5.8 | 6.7 | 4.9 |
| (MT × Tb) | ||||||||
| Amount of foreign | 0.3 | 0.5 | 0.3 | 0.4 | 0.4 | 0.4 | 0.4 | 0.3 |
| matter (g) | ||||||||
| Oxygen | 0.08 | 0.04 | 0.04 | 0.02 | 0.01 | 0.30 | 0.40 | 0.08 |
| transmission rate | ||||||||
| (cc, μm/m2, day) | ||||||||
| Fuel permeation | 0.31 | 0.16 | 0.16 | 0.11 | 0.03 | 0.67 | 1.44 | 0.31 |
| amount (g) | ||||||||
| Impact resistance | A | A | A | A | A | A | A | A |
| (multilayer) | ||||||||
| Impact resistance | A | A | A | A | A | A | A | A |
| (D single layer) | ||||||||
| Exam- | Exam- | Exam- | Exam- | Exam- | Exam- | Exam- | Exam- | ||
| ple 9 | ple 10 | ple 11 | ple 12 | ple 13 | ple 14 | ple 15 | ple 16 | ||
| A | Type | A9 | A1 | A1 | A1 | A1 | A1 | A1 | A1 |
| Thickness | 100 | 20 | 300 | 100 | 100 | 100 | 100 | 100 | |
| (μm) | |||||||||
| B | Type | B1 | B1 | B1 | B2 | B3 | B4 | B5 | B6 |
| Thickness | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
| (μm) | |||||||||
| C | Type | C1 | C1 | C1 | C1 | C1 | C1 | C1 | C1 |
| Thickness | 1500 | 1500 | 1500 | 1500 | 1500 | 1500 | 1500 | 1500 | |
| (μm) | |||||||||
| D | A (mass %) | 3.8 | 0.8 | 10.5 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 |
| B (mass %) | 6.0 | 6.2 | 5.6 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | |
| C (mass %) | 90.2 | 93.0 | 83.9 | 90.2 | 90.2 | 90.2 | 90.2 | 90.2 | |
| Mg (μmol/g) | 0.26 | 0.22 | 0.36 | 0.26 | 0.26 | 0.12 | 0.56 | 0.26 | |
| K + Na | 0.33 | 0.08 | 1.05 | 0.38 | 0.38 | 0.38 | 0.38 | 0.38 | |
| (μmol/g) | |||||||||
| Al (ppm) | 6.0 | 6.2 | 5.6 | 6.0 | 6.0 | 1.9 | 15.0 | 6.0 | |
| Ti (ppm) | 0.14 | 0.15 | 0.13 | 0.14 | 0.14 | 0.14 | 0.14 | 0.00 | |
| Ta/Tb | 0.5 | 0.1 | 1.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
| Thickness | 1800 | 1800 | 1800 | 1800 | 1800 | 1800 | 1800 | 1800 | |
| (μm) | |||||||||
| Ta/Tt | 0.020 | 0.0040 | 0.057 | 0.020 | 0.020 | 0.020 | 0.020 | 0.020 |
| Tb/Tt | 0.039 | 0.040 | 0.038 | 0.039 | 0.039 | 0.039 | 0.039 | 0.039 |
| (Tc + Td)/Tt | 0.94 | 0.96 | 0.91 | 0.94 | 0.94 | 0.94 | 0.94 | 0.94 |
| Td/(Tc + Td) | 0.38 | 0.38 | 0.38 | 0.38 | 0.38 | 0.38 | 0.38 | 0.38 |
| Ma/Mb | 9.4 | 2.1 | 2.1 | 2.1 | 2.1 | 2.1 | 2.1 | 2.1 |
| Ma/Mc | 243 | 54 | 54 | 54 | 54 | 54 | 54 | 54 |
| Ta/Tb | 0.50 | 0.10 | 1.5 | 0.50 | 0.50 | 0.50 | 0.50 | 0.50 |
| (VA × Ta)/ | 4.9 | 1.0 | 15 | 4.9 | 4.9 | 16 | 1.9 | 4.9 |
| (MT × Tb) | ||||||||
| Amount of foreign | 0.6 | 0.8 | 0.3 | 0.9 | 0.9 | 0.6 | 0.5 | 0.3 |
| matter (g) | ||||||||
| Oxygen | 0.08 | 0.40 | 0.03 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 |
| transmission rate | ||||||||
| (cc, μm/m2, day) | ||||||||
| Fuel permeation | 0.31 | 1.55 | 0.10 | 0.31 | 0.31 | 0.31 | 0.31 | 0.31 |
| amount (g) | ||||||||
| Impact resistance | A | A | B | A | A | A | A | A |
| (multilayer) | ||||||||
| Impact resistance | A | A | B | A | A | A | A | A |
| (D single layer) | ||||||||
| TABLE 5 | ||||||||||
| Exam- | Exam- | Exam- | Exam- | Exam- | Exam- | Exam- | Exam- | Exam- | ||
| ple 17 | ple 18 | ple 19 | ple 20 | ple 21 | ple 22 | ple 23 | ple 24 | ple 25 | ||
| A | Type | A1 | A1 | A1 | A1 | A1 | A1 | A1 | A1 | A1 |
| Thickness | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
| (μm) | ||||||||||
| B | Type | B7 | B8 | B9 | B1 | B1 | B1 | B1 | B1 | B1 |
| Thickness | 100 | 100 | 100 | 4 | 300 | 100 | 100 | 100 | 100 | |
| (μm) | ||||||||||
| C | Type | C1 | C1 | C1 | C1 | C1 | C2 | C3 | C4 | C1 |
| Thickness | 1500 | 1500 | 1500 | 1500 | 1500 | 1500 | 1500 | 1500 | 300 | |
| (μm) | ||||||||||
| D | A (mass %) | 3.8 | 3.8 | 3.8 | 4.0 | 3.4 | 3.8 | 3.8 | 3.8 | 13.5 |
| B (mass %) | 6.0 | 6.0 | 6.0 | 0.3 | 16.1 | 6.0 | 6.0 | 6.0 | 21.6 | |
| C (mass %) | 90.2 | 90.2 | 90.2 | 95.7 | 80.5 | 90.2 | 90.2 | 90.2 | 64.9 | |
| Mg (μmol/g) | 0.26 | 0.26 | 0.26 | 0.07 | 0.59 | 0.71 | 0.26 | 0.26 | 0.93 | |
| K + Na | 0.38 | 0.38 | 0.38 | 0.40 | 0.34 | 0.38 | 0.38 | 0.38 | 1.35 | |
| (μmol/g) | ||||||||||
| Al (ppm) | 6.0 | 6.0 | 6.0 | 0.3 | 16.1 | 6.0 | 6.0 | 6.0 | 21.6 | |
| Ti (ppm) | 1.20 | 0.14 | 0.14 | 0.01 | 0.39 | 0.14 | 0.14 | 0.14 | 0.52 | |
| Ta/Tb | 0.5 | 0.5 | 0.5 | 12.5 | 0.167 | 0.5 | 0.5 | 0.5 | 0.5 | |
| Thickness | 1800 | 1800 | 1800 | 1800 | 1800 | 1800 | 1800 | 1800 | 1800 | |
| (μm) | ||||||||||
| Ta/Tt | 0.020 | 0.020 | 0.020 | 0.020 | 0.018 | 0.020 | 0.020 | 0.020 | 0.037 |
| Tb/Tt | 0.039 | 0.039 | 0.039 | 0.0016 | 0.11 | 0.039 | 0.039 | 0.039 | 0.074 |
| (Tc + Td)/Tt | 0.94 | 0.94 | 0.94 | 0.98 | 0.87 | 0.94 | 0.94 | 0.94 | 0.89 |
| Td/(Tc + Td) | 0.38 | 0.38 | 0.38 | 0.38 | 0.38 | 0.38 | 0.38 | 0.38 | 0.75 |
| Ma/Mb | 2.1 | 7.6 | 0.38 | 2.1 | 2.1 | 2.1 | 2.1 | 2.1 | 2.1 |
| Ma/Mc | 54 | 54 | 54 | 54 | 54 | 54 | 380 | 13 | 54 |
| Ta/Tb | 0.50 | 0.50 | 0.50 | 13 | 0.17 | 0.50 | 0.50 | 0.50 | 0.50 |
| (VA × Ta)/ | 4.9 | 4.9 | 4.9 | 122 | 1.6 | 4.9 | 4.9 | 4.9 | 4.9 |
| (MT × Tb) | |||||||||
| Amount of foreign | 0.3 | 0.3 | 0.4 | 0.8 | 0.5 | 0.8 | 0.7 | 0.3 | 0.4 |
| matter (g) | |||||||||
| Oxygen | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 |
| transmission rate | |||||||||
| (cc, μm/m2, day) | |||||||||
| Fuel permeation | 0.31 | 0.31 | 0.31 | 0.31 | 0.31 | 0.31 | 0.31 | 0.31 | 0.31 |
| amount (g) | |||||||||
| Impact resistance | A | A | A | A | A | A | A | A | B |
| (multilayer) | |||||||||
| Impact resistance | A | A | A | A | A | A | A | A | B |
| (D single layer) | |||||||||
| Exam- | Exam- | Exam- | Exam- | Exam- | Exam- | Exam- | Exam- | ||
| ple 26 | ple 27 | ple 28 | ple 29 | ple 30 | ple 31 | ple 32 | ple 33 | ||
| A | Type | A1 | A1 | A1 | A1 | A1 | A10 | A11 | A10 |
| Thickness | 100 | 20 | 100 | 100 | 300 | 100 | 100 | 100 | |
| (μm) | |||||||||
| B | Type | B1 | B1 | B1 | B1 | B4 | B9 | B8 | B1 |
| Thickness | 100 | 300 | 100 | 100 | 4 | 100 | 100 | 100 | |
| (μm) | |||||||||
| C | Type | C1 | C1 | C1 | C1 | C1 | C1 | C1 | C4 |
| Thickness | 3000 | 1500 | 1500 | 1500 | 300 | 1500 | 1500 | 1500 | |
| (μm) | |||||||||
| D | A (mass %) | 2.0 | 0.7 | 3.8 | 3.8 | 38.2 | 3.8 | 3.8 | 3.8 |
| B (mass %) | 3.2 | 16.5 | 6.0 | 6.0 | 0.8 | 6.0 | 6.0 | 6.0 | |
| C (mass %) | 94.8 | 82.8 | 90.2 | 90.2 | 61.0 | 90.2 | 90.2 | 90.2 | |
| Mg (μmol/g) | 0.14 | 0.55 | 0.26 | 0.26 | 0.64 | 0.26 | 0.26 | 0.26 | |
| K + Na | 0.20 | 0.07 | 0.38 | 0.38 | 3.81 | 0.38 | 0.38 | 0.38 | |
| (μmol/g) | |||||||||
| Al (ppm) | 3.2 | 16.5 | 6.0 | 6.0 | 0.3 | 6.0 | 6.0 | 6.0 | |
| Ti (ppm) | 0.08 | 0.40 | 0.14 | 0.14 | 0.02 | 0.14 | 0.14 | 0.14 | |
| Ta/Tb | 0.5 | 0.0333 | 0.5 | 0.5 | 37.5 | 0.5 | 0.5 | 0.5 | |
| Thickness | 1800 | 1800 | 100 | 16000 | 1800 | 1800 | 1800 | 1800 | |
| (μm) | |||||||||
| Ta/Tt | 0.012 | 0.0037 | 0.029 | 0.0052 | 0.11 | 0.020 | 0.020 | 0.020 |
| Tb/Tt | 0.025 | 0.11 | 0.059 | 0.0104 | 0.0030 | 0.039 | 0.039 | 0.039 |
| (Tc + Td)/Tt | 0.96 | 0.89 | 0.91 | 0.98 | 0.89 | 0.94 | 0.94 | 0.94 |
| Td/(Tc + Td) | 0.23 | 0.38 | 0.03 | 0.84 | 0.75 | 0.38 | 0.38 | 0.38 |
| Ma/Mb | 2.1 | 2.1 | 2.1 | 2.1 | 2.1 | 0.10 | 34 | 0.56 |
| Ma/Mc | 54 | 54 | 54 | 54 | 54 | 14 | 243 | 3 |
| Ta/Tb | 0.50 | 0.033 | 0.50 | 0.50 | 38 | 0.50 | 0.50 | 0.50 |
| (VA × Ta)/ | 4.9 | 0.32 | 4.9 | 4.9 | 972 | 4.9 | 4.9 | 4.9 |
| (MT × Tb) | ||||||||
| Amount of foreign | 0.3 | 0.3 | 0.3 | 0.7 | 0.8 | 0.5 | 0.7 | 0.3 |
| matter (g) | ||||||||
| Oxygen | 0.08 | 0.40 | 0.08 | 0.08 | 0.03 | 0.08 | 0.08 | 0.08 |
| transmission rate | ||||||||
| (cc, μm/m2, day) | ||||||||
| Fuel permeation | 0.31 | 1.55 | 0.31 | 0.31 | 0.10 | 0.31 | 0.31 | 0.31 |
| amount (g) | ||||||||
| Impact resistance | A | A | A | B | B | A | A | A |
| (multilayer) | ||||||||
| Impact resistance | A | A | A | B | B | A | A | A |
| (D single layer) | ||||||||
| TABLE 6 | |||||||||
| Exam- | Exam- | Exam- | Comparative | Comparative | Comparative | Comparative | Comparative | ||
| ple 34 | ple 35 | ple 36 | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | ||
| A | Type | A11 | A15 | A16 | A12 | A13 | A14 | A1 | A1 |
| Thickness | 100 | 100 | 100 | 100 | 100 | 100 | 10 | 100 | |
| (μm) | |||||||||
| B | Type | B1 | B16 | B17 | B1 | B10 | B11 | B1 | B12 |
| Thickness | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
| (μm) | |||||||||
| C | Type | C3 | C1 | C1 | C1 | C1 | C1 | C1 | C1 |
| Thickness | 1500 | 1500 | 1500 | 1500 | 1500 | 1500 | 1500 | 1500 | |
| (μm) | |||||||||
| D | A (mass %) | 3.8 | 3.8 | 3.8 | 3.6 | 3.8 | 3.8 | 0.4 | 3.8 |
| B (mass %) | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.2 | 6.0 | |
| C (mass %) | 90.2 | 90.2 | 90.2 | 90.4 | 90.2 | 90.2 | 93.4 | 90.2 | |
| Mg (μmol/g) | 0.26 | 0.10 1) | 0.16 2) | 0.20 | 0.26 | 0.26 | 0.21 | 0.26 | |
| K + Na | 0.38 | 0.38 | 0.38 | 0.35 | 0.38 | 0.38 | 0.04 | 0.38 | |
| (μmol/g) | |||||||||
| Al (ppm) | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.2 | 6.0 | |
| Ti (ppm) | 0.14 | 0.14 | 0.14 | 0.14 | 0.14 | 0.14 | 0.15 | 0.14 | |
| Ta/Tb | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.05 | 0.5 | |
| Thickness | 1800 | 1800 | 1800 | 1800 | 1800 | 1800 | 1800 | 1800 | |
| (μm) | |||||||||
| Ta/Tt | 0.020 | 0.020 | 0.020 | 0.020 | 0.020 | 0.020 | 0.0020 | 0.020 |
| Tb/Tt | 0.039 | 0.039 | 0.039 | 0.039 | 0.039 | 0.039 | 0.040 | 0.039 |
| (Tc + Td)/Tt | 0.94 | 0.94 | 0.94 | 0.94 | 0.94 | 0.94 | 0.96 | 0.94 |
| Td/(Tc + Td) | 0.38 | 0.38 | 0.38 | 0.38 | 0.38 | 0.38 | 0.38 | 0.38 |
| Ma/Mb | 9.4 | 2.1 | 2.1 | 2.0 | 73 | 0.033 | 2.1 | 2.1 |
| Ma/Mc | 1700 | 54 | 54 | 51 | 314 | 7 | 54 | 54 |
| Ta/Tb | 0.50 | 0.50 | 0.50 | 0.50 | 0.50 | 0.50 | 0.050 | 0.50 |
| (VA × Ta)/ | 4.9 | 13.1 | 8.0 | 7.3 | 4.9 | 4.9 | 0.49 | 4.9 |
| (MT × Tb) | ||||||||
| Amount of foreign | 0.8 | 0.6 | 0.5 | 0.4 | 1.2 | 2 | 0.6 | 2.1 |
| matter (g) | ||||||||
| Oxygen | 0.08 | 0.08 | 0.08 | 0.64 | 0.08 | 0.08 | 0.80 | 0.08 |
| transmission rate | ||||||||
| (cc, μm/m2, day) | ||||||||
| Fuel permeation | 0.31 | 0.31 | 0.31 | 2.41 | 0.31 | 0.31 | 3.01 | 0.31 |
| amount (g) | ||||||||
| Impact resistance | A | A | A | A | A | A | A | A |
| (multilayer) | ||||||||
| Impact resistance | A | A | A | A | A | A | A | A |
| (D single layer) | ||||||||
| Comparative | Comparative | Comparative | Comparative | Comparative | Comparative | Comparative | Comparative | ||
| Example 6 | Example 7 | Example 8 | Example 9 | Example 10 | Example 11 | Example 12 | Example 13 | ||
| A | Type | A1 | A1 | A1 | A1 | A1 | A1 | A1 | A13 |
| Thickness | 100 | 100 | 100 | 100 | 100 | 100 | 300 | 100 | |
| (μm) | |||||||||
| B | Type | B13 | B14 | B15 | B1 | B1 | B1 | B4 | B1 |
| Thickness | 100 | 100 | 100 | 3 | 350 | 100 | 4 | 100 | |
| (μm) | |||||||||
| C | Type | C1 | C1 | C1 | C1 | C1 | C1 | C1 | C3 |
| Thickness | 1500 | 1500 | 1500 | 1500 | 1500 | 1500 | 300 | 1500 | |
| (μm) | |||||||||
| D | A (mass %) | 3.8 | 3.8 | 3.8 | 4.0 | 3.3 | 3.8 | 38.2 | 3.8 |
| B (mass %) | 6.0 | 6.0 | 6.0 | 0.2 | 18.3 | 6.0 | 0.8 | 6.0 | |
| C (mass %) | 90.2 | 90.2 | 90.2 | 95.8 | 78.4 | 90.2 | 61.0 | 90.2 | |
| Mg (μmol/g) | 0.26 | 0.09 | 0.68 | 0.07 | 0.66 | 0.26 | 0.64 | 0.26 | |
| K + Na | 0.38 | 0.38 | 0.38 | 0.40 | 0.33 | 0.38 | 3.81 | 0.38 | |
| (μmol/g) | |||||||||
| Al (ppm) | 6.0 | 0.8 | 18.8 | 0.2 | 18.3 | 6.0 | 0.3 | 6.0 | |
| Ti (ppm) | 0.14 | 0.14 | 0.14 | 0.00 | 0.44 | 0.14 | 0.02 | 0.14 | |
| Ta/Tb | 0.5 | 0.5 | 0.5 | 16.667 | 0.143 | 0.5 | 37.5 | 0.5 | |
| Thickness | 1800 | 1800 | 1800 | 1800 | 1800 | 30000 | 1300 | 1800 | |
| (μm) | |||||||||
| Ta/Tt | 0.020 | 0.020 | 0.020 | 0.020 | 0.018 | 0.0030 | 0.136 | 0.020 |
| Tb/Tt | 0.039 | 0.039 | 0.039 | 0.0012 | 0.13 | 0.0060 | 0.0036 | 0.039 |
| (Tc + Td)/Tt | 0.94 | 0.94 | 0.94 | 0.98 | 0.86 | 0.991 | 0.86 | 0.94 |
| Td/(Tc + Td) | 0.38 | 0.38 | 0.38 | 0.38 | 0.38 | 0.91 | 0.68 | 0.38 |
| Ma/Mb | 2.1 | 2.1 | 2.1 | 2.1 | 2.1 | 2.1 | 2.1 | 12 |
| Ma/Mc | 54 | 54 | 54 | 54 | 54 | 54 | 54 | 2200 |
| Ta/Tb | 0.50 | 0.50 | 0.50 | 17 | 0.14 | 0.50 | 38 | 0.50 |
| (VA × Ta)/ | 4.9 | 39 | 1.6 | 162 | 1.4 | 4.9 | 972 | 4.9 |
| (MT × Tb) | ||||||||
| Amount of foreign | 2.4 | 1.3 | 1.7 | 2.9 | 1.2 | 1.1 | 1.9 | 3.0 |
| matter (g) | ||||||||
| Oxygen | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.03 | 0.08 |
| transmission rate | ||||||||
| (cc, μm/m2, day) | ||||||||
| Fuel permeation | 0.31 | 0.31 | 0.31 | 0.31 | 0.31 | 0.31 | 0.10 | 0.31 |
| amount (g) | ||||||||
| Impact resistance | A | A | A | A | A | D | D | A |
| (multilayer) | ||||||||
| Impact resistance | A | A | A | A | A | D | D | A |
| (D single layer) | ||||||||
| 1) Zn content, | ||||||||
| 2) Ca content | ||||||||
Claims (19)
1. A fuel container composed of a multilayer structure comprising:
a first layer comprising an ethylene-vinyl alcohol copolymer;
a second layer comprising an adhesive resin;
a third layer comprising a high-density polyethylene; and
a fourth layer comprising a resin composition, wherein the resin composition comprises the ethylene-vinyl alcohol copolymer, the adhesive resin and the high-density polyethylene,
wherein the ethylene-vinyl alcohol copolymer comprises from 15 to 44 mol % of ethylene,
the adhesive resin is a maleic anhydride-modified polyolefin having an acid value of from 0.1 to 10 mgKOH/g and comprising from 1 to 8.5 μmol/g of magnesium element, calcium element, zinc element, or a combination thereof, and
the fuel container satisfies formulas (1) to (6):
0.05≤Ma/Mb≤40 (1);
2≤Ma/Mc≤1800 (2),
0.05≤Ma/Mb≤40 (1);
2≤Ma/Mc≤1800 (2),
wherein Ma represents an MFR (g/10 min) of the ethylene-vinyl alcohol copolymer, measured at 210° C. under a load of 2160 g;
Mb represents an MFR (g/10 min) of the adhesive resin, measured at 210° C. under a load of 2160 g; and
Mc represents an MFR (g/10 min) of the high-density polyethylene, measured at 210° C. under a load of 2160 g;
0.003≤Ta/Tt≤0.12 (3);
0.0015≤Tb/Tt≤0.12 (4);
0.83≤(Tc+Td)/Tt≤0.99 (5); and
0.02≤Td/(Tc+Td)≤0.90 (6),
0.003≤Ta/Tt≤0.12 (3);
0.0015≤Tb/Tt≤0.12 (4);
0.83≤(Tc+Td)/Tt≤0.99 (5); and
0.02≤Td/(Tc+Td)≤0.90 (6),
wherein Ta represents a total thickness of the first layer,
Tb represents a total thickness of the second layer,
Tc represents a total thickness of the third layer,
Td represents a total thickness of the fourth layer, and
Tt represents an overall thickness (Ta+Tb+Tc+Td).
2. The fuel container according to claim 1 , wherein
the resins consist of from 1 to 20 mass % of the ethylene-vinyl alcohol copolymer, from 1 to 20 mass % of the adhesive resin, and from 60 to 98 mass % of the high-density polyethylene.
3. The fuel container according to claim 1 , satisfying formula (7):
0.3≤(VA×Ta)/(MT×Tb)≤1000 (7),
0.3≤(VA×Ta)/(MT×Tb)≤1000 (7),
wherein VA represents a vinyl alcohol content (mol %) in the ethylene-vinyl alcohol copolymer;
MT represents a total amount (μmol/g) of magnesium element, calcium element, and zinc element in the adhesive resin;
Ta represents the total thickness (μm) of the first layer; and
Tb represents the total thickness (μm) of the second layer.
4. The fuel container according to claim 1 , wherein
the resin composition further comprises from 0.001 to 1 μmol/g of magnesium element, calcium element, zinc element, or a combination thereof.
5. The fuel container according to claim 1 , wherein
the resin composition further comprises from 0.001 to 5 μmol/g of an alkali metal element.
6. The fuel container according to claim 1 , wherein
the ethylene-vinyl alcohol copolymer further comprises from 0.04 to 13 μmol/g of an alkali metal element.
7. The fuel container according to claim 1 , wherein
the maleic anhydride-modified polyolefin further comprises from 0.35 to 11.5 μmol/g of aluminum element and 0.5 μmol/g or less of titanium element.
8. The fuel container according to claim 1 , wherein
the high-density polyethylene comprises at least one element selected from the group consisting of magnesium element, calcium element, and zinc element for a total amount of 0.5 μmol/g or less.
9. The fuel container according to claim 1 , wherein
the first layer and the second layer are in contact with each other.
10. The fuel container according to claim 1 , wherein the ethylene-vinyl alcohol copolymer comprises from 18 to 38 mol % of ethylene.
11. A fuel container composed of a multilayer structure comprising:
a first layer comprising an ethylene-vinyl alcohol copolymer;
a second layer comprising an adhesive resin;
a third layer comprising a high-density polyethylene; and
a fourth layer comprising a resin composition, wherein the resin composition comprises the ethylene-vinyl alcohol copolymer, the adhesive resin and the high-density polyethylene,
wherein the ethylene-vinyl alcohol copolymer comprises from 15 to 44 mol % of ethylene,
the adhesive resin is a maleic anhydride-modified polyolefin having an acid value of from 0.1 to 10 mgKOH/g and comprising from 1 to 8.5 μmol/g of magnesium element, calcium element, zinc element, or a combination thereof, and the fuel container satisfies formulas (1) to (6):
0.05≤Ma/Mb≤40 (1);
2≤Ma/Mc≤1800 (2);
0.05≤Ma/Mb≤40 (1);
2≤Ma/Mc≤1800 (2);
wherein Ma represents an MFR (g/10 min) of the ethylene-vinyl alcohol copolymer, measured at 210° C. under a load of 2160 g, Mb represents an MFR (g/10 min) of the adhesive resin, measured at 210° C. under a load of 2160 g, and Mc represents an MFR (g/10 min) of the high-density polyethylene, measured at 210° C. under a load of 2160 g;
0.003≤Ta/Tt≤0.12 (3);
0.0015≤Tb/Tt≤0.12 (4);
0.83≤(Tc+Td)/Tt≤0.99 (5); and
0.02≤Td/(Tc+Td)≤0.90 (6),
0.003≤Ta/Tt≤0.12 (3);
0.0015≤Tb/Tt≤0.12 (4);
0.83≤(Tc+Td)/Tt≤0.99 (5); and
0.02≤Td/(Tc+Td)≤0.90 (6),
wherein Ta represents a total thickness of the first layer, Tb represents a total thickness of the second layer, Tc represents a total thickness of the third layer, Td represents a total thickness of the fourth layer, and Tt represents an overall thickness (Ta+Tb+Tc+Td), and
wherein the high-density polyethylene comprises at least one element selected from the group consisting of magnesium element, calcium element, and zinc element.
12. The fuel container according to claim 11 , wherein
the resin composition comprises from 1 to 20 mass % of the ethylene-vinyl alcohol copolymer, from 1 to 20 mass % of the adhesive resin, and from 60 to 98 mass % of the high-density polyethylene.
13. The fuel container according to claim 11 , satisfying formula
0.3≤(VA×Ta)/(MT×Tb)≤1000 (7),
0.3≤(VA×Ta)/(MT×Tb)≤1000 (7),
wherein VA represents a vinyl alcohol content (mol %) in the ethylene-vinyl alcohol copolymer;
MT represents a total amount (μmol/g) of magnesium element, calcium element, and zinc element in the adhesive resin;
Ta represents the total thickness (μm) of the first layer; and
Tb represents the total thickness (μm) of the second layer.
14. The fuel container according to claim 11 , wherein
the resin composition further comprises from 0.001 to 1 μmol/g of magnesium element, calcium element, zinc element, or a combination thereof.
15. The fuel container according to claim 11 , wherein
the resin composition further comprises from 0.001 to 5 μmol/g of an alkali metal element.
16. The fuel container according to claim 11 , wherein
the ethylene-vinyl alcohol copolymer further comprises from 0.04 to 13 μmol/g of an alkali metal element.
17. The fuel container according to claim 11 , wherein
the maleic anhydride-modified polyolefin further comprises from 0.35 to 11.5 μmol/g of aluminum element and 0.5 μmol/g or less of titanium element.
18. The fuel container according to claim 11 , wherein
the first layer and the second layer are in contact with each other.
19. The fuel container according to claim 11 , wherein the
ethylene-vinyl alcohol copolymer comprises from 18 to 38 mol % of ethylene.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JPJP2016-130816 | 2016-06-30 | ||
| JP2016-130816 | 2016-06-30 | ||
| JP2016130816 | 2016-06-30 | ||
| PCT/JP2017/023869 WO2018003904A1 (en) | 2016-06-30 | 2017-06-29 | Fuel container |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| US20190248115A1 US20190248115A1 (en) | 2019-08-15 |
| US11279117B2 true US11279117B2 (en) | 2022-03-22 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US16/307,006 Active 2038-05-06 US11279117B2 (en) | 2016-06-30 | 2017-06-29 | Fuel container |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US11279117B2 (en) |
| EP (1) | EP3480125B1 (en) |
| JP (1) | JP6522857B2 (en) |
| CN (1) | CN109415133B (en) |
| WO (1) | WO2018003904A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7301558B2 (en) * | 2019-03-04 | 2023-07-03 | 株式会社クラレ | Resin composition, multilayer structure, packaging container, and method for producing resin composition |
| JPWO2021029353A1 (en) * | 2019-08-09 | 2021-02-18 |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP6522857B2 (en) | 2019-05-29 |
| CN109415133B (en) | 2019-09-17 |
| CN109415133A (en) | 2019-03-01 |
| EP3480125A4 (en) | 2020-03-25 |
| JPWO2018003904A1 (en) | 2019-02-14 |
| EP3480125B1 (en) | 2022-01-19 |
| US20190248115A1 (en) | 2019-08-15 |
| EP3480125A1 (en) | 2019-05-08 |
| WO2018003904A1 (en) | 2018-01-04 |
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